You must register once your taxable turnover, excluding VAT, passes £90,000 in any rolling 12-month period. Once registered, standard rate VAT is the better default for most service contractors, because most of them turn out to be limited cost businesses on the Flat Rate Scheme (FRS).
The Flat Rate Scheme often stops being attractive for service contractors who are limited cost businesses, but it is not automatically wrong. At 16.5% the FRS payment is usually close to the VAT due under normal accounting, so the answer depends on recoverable input VAT, the first-year 1% reduction and any turnover excluded from the FRS calculation.
Whether you are a limited cost business turns on your spending on relevant goods, which has to clear both 2% of your flat rate turnover and £1,000 a year. Software, subscriptions, travel, accountancy fees and capital equipment such as laptops do not count towards it, which is why most IT and consultancy contractors fail the test without realising.
Below the threshold, voluntary registration is usually worth considering where your clients are VAT-registered businesses and you have meaningful VAT-bearing costs. Everything here assumes a UK-established contractor company making standard-rated supplies, and is general information for the 2026/27 tax year rather than advice for your situation.
Most contractors know they have to register for VAT at some point. Far fewer are clear on when voluntary registration makes sense, how the Flat Rate Scheme actually works, or why the same scheme can leave one contractor better off and another slightly worse off than doing nothing. The mistakes that cost money here are structural rather than arithmetical: registering late, or staying on a scheme that quietly works against you every quarter.
This guide walks through the registration decision, the FRS versus standard rate calculation, and the specific test that catches most contractors out: the limited cost business rule. The worked examples put numbers on both outcomes, on one clearly stated set of assumptions.
General information about UK VAT for a single-director contractor company established in the UK and supplying standard-rated services. Not advice for your circumstances. VAT is unusually fact-sensitive: the place of supply of your services, the rate applying to what you supply, your cost profile and your client mix can each move the answer. Take advice on your own position before registering, choosing a scheme, or leaving one.
Do you need to register for VAT?
You must register for VAT when your taxable turnover exceeds £90,000 in any rolling 12-month period. Taxable turnover means the value of your taxable supplies excluding VAT, not the totals on your invoices, and it leaves out exempt income. This is the mandatory registration threshold for 2026/27. Two tests apply, and what the law actually requires of you is that you notify HMRC that you are liable to be registered. People say "register within 30 days" as shorthand, but the 30-day clock is on the notification, not on HMRC completing the registration or issuing your VAT number:
- The backward-looking test: if your taxable turnover for any rolling 12-month period has gone over £90,000, you must notify HMRC within 30 days of the end of the month in which you crossed. That is the part most often misread: the 30 days runs from the end of the month, not from the date you went over. Registration then takes effect from the first day of the second month after you crossed. So if your turnover passes £90,000 at any point in July, whether that is 3 July or 31 July, you must notify HMRC by 30 August and you are registered with effect from 1 September.
- The forward-looking test: if at any point you have reasonable grounds to believe your taxable turnover will exceed £90,000 in the next 30 days alone, you must notify HMRC by the end of that 30-day period, and registration takes effect from the date you formed that expectation, not from the date turnover actually crosses the line. In practice, act as soon as you sign the contract that takes you over.
There is one release valve. If you go over the threshold because of a genuine one-off spike, you can ask HMRC for an exception from registration, on the basis that you expect taxable turnover for the following 12 months to stay below the de-registration threshold of £88,000. You still have to notify within the same 30 days and ask for the exception at that point; it is not something you can rely on quietly and explain afterwards.
HMRC charges a "failure to notify" penalty for late VAT registration, calculated as a percentage of the VAT due from the date you should have registered. The percentage turns mainly on behaviour: broadly 30% where the failure was not deliberate, 70% where it was deliberate, and 100% where it was deliberate and concealed. Those are maximums, and disclosure reduces them substantially: for a non-deliberate failure disclosed unprompted within 12 months, the penalty range starts at 0%, so it can be reduced to nil. That is not automatic: how far down the range HMRC goes depends on the quality of your disclosure, and on telling, helping and giving access to records. It is still an important reason to act the moment you suspect you have crossed the threshold: raised early, the same mistake can cost nothing; found by HMRC first, it can cost a great deal. You will still owe the VAT itself, plus interest, either way.
Should you register voluntarily?
If your turnover is below £90,000, you have the option to register voluntarily. Whether this is worthwhile depends on your client base and your costs.
The voluntary registration decision
Are your clients VAT registered businesses? If yes, they may normally recover the VAT you charge, subject to their own recovery position, so for most of them it costs nothing net. That removes the main commercial objection to voluntary registration. A partly exempt client is the exception: they may bear some of it as a real cost.
Do you have meaningful VAT-able costs? Software subscriptions, equipment, phone, professional services. If you're spending £3,000+ per year net on business costs that carry 20% VAT, you're leaving £600 of reclaimable input VAT on the table each year by staying unregistered. Watch the net/gross distinction: £3,000 including VAT contains only £500 of reclaimable VAT (£3,000 ÷ 6), not £600.
Do you want to look more established to larger clients? A VAT number reads as a sign of an established business, and some procurement teams expect one. Be honest about the weight of it, though: registering voluntarily means the number evidences nothing about your turnover. Presentation rather than substance, and not a reason to register on its own.
Are any of your clients unable to recover VAT? That covers consumers, unregistered businesses and partly exempt businesses. For them, adding VAT to your invoices increases their cost with no reclaim, or with only partial reclaim. This is the main downside of voluntary registration.
Those four questions are not equally weighted. If your clients cannot recover the VAT you charge, adding it either prices you up or comes out of your own margin. This is usually the decisive commercial issue for a low-cost contractor, although the outcome still depends on pricing, margin and recoverable input VAT. Your costs size the benefit once that is settled, and they have to be genuinely VAT-bearing to count at all.
So: for contractors invoicing VAT-registered businesses at a day rate plus VAT, voluntary registration is worth looking at well below £90,000, particularly where the business has meaningful VAT-bearing costs. If you bill consumers or unregistered small businesses, or you are on a fixed fee you cannot add VAT on top of, it usually is not.
One point that can tip the decision and is easy to miss: on registering you may be able to recover pre-registration input VAT. Broadly, that covers goods bought in the four years before registration that you still hold, and services received in the six months before registration. If you have recently bought equipment, it is worth totalling before you decide.
Which VAT rate applies to your work
This guide assumes what you supply is standard-rated at 20%, which is what almost all IT, engineering and management consultancy to a UK customer is. Worth saying out loud, because the UK also has a reduced rate of 5% and a zero rate, and they attach to categories of supply rather than to types of business: certain residential conversions and renovations, some domestic energy work, the construction of new qualifying dwellings. For most day-rate consultancy work they simply will not arise. For a contractor doing building or building-services work they can.
Two reasons to check before you pick a scheme. The rate you charge is fixed by what you supply, and FRS does not change it. And zero-rated or exempt income still counts in your flat rate turnover, so on FRS you would pay the flat rate on income you charged little or no VAT on.
Standard rate VAT vs the Flat Rate Scheme
Once registered, you choose how to account for VAT. The two options that decide how much you pay are standard rate and the Flat Rate Scheme, and most of this guide is about choosing between them. Two further schemes affect only when you pay:
- Cash Accounting Scheme: you account for VAT when you are actually paid rather than when you invoice, which matters if your clients pay at 60 or 90 days. You can join if your estimated VAT-taxable turnover, excluding VAT, for the next 12 months is not more than £1.35 million, and you must leave once turnover exceeds £1.6 million. You cannot combine it with the Flat Rate Scheme, because FRS has its own cash-based turnover method that achieves much the same thing.
- Annual Accounting Scheme: one return a year with interim payments on account, open on the same basis, an estimated VAT-taxable turnover excluding VAT of not more than £1.35 million for the next 12 months. This one can be combined with FRS.
For a contractor on standard rate with slow-paying clients, cash accounting is usually the more valuable of the two and is worth asking about at registration.
Standard rate VAT
You charge VAT on your invoices at the rate applying to what you supply, and account for that output VAT to HMRC. Against it you recover input VAT, but only to the extent it is properly attributable to your taxable business activities, supported by the required VAT evidence, and not blocked by a specific rule such as the one on business entertainment. The net amount is paid to, or reclaimed from, HMRC each quarter. If your costs are high, standard rate can leave a relatively low net payment.
The Flat Rate Scheme (FRS)
You still charge 20% VAT on invoices. But instead of calculating input and output VAT precisely, you pay a fixed percentage of your gross (VAT-inclusive) turnover directly to HMRC. The FRS percentage is set by sector: "Computer and IT consultancy or data processing" is 14.5%, "Management consultancy" is 14%, "Accountancy or book-keeping" is 14.5%, and "Architect, civil and structural engineer or surveyor" is 14.5%. The difference between the 20% you charge your clients and the flat rate you hand to HMRC stays in the company. That difference is not what the scheme is worth to you, though, because on FRS you give up the right to reclaim input VAT on your costs. What FRS is actually worth is the difference between the 20% you charged and the flat rate you paid, less the input VAT you would have reclaimed on standard rate. The worked comparison further down does it both ways so you can see the size of that second deduction.
Choosing the sector is your responsibility, and it is not always obvious. An engineering consultant who is not an architect, civil or structural engineer or surveyor may instead fall under "Business services not listed elsewhere" at 12%. If your work spans two sectors, pick the one generating the larger share of turnover and apply that single rate to everything; you cannot split turnover between rates. Go with the sector that most closely describes what your business actually does, and check HMRC's sector list if you are unsure. HMRC can review the sector chosen, so keep a contemporaneous note of your activities, your turnover mix and why the sector you picked was the reasonable main-business classification at the time. If the nature of your business changes and a different sector becomes appropriate, you must tell HMRC in writing within 30 days of the change.
The appeal is simplicity, plus a potential surplus for service contractors with low costs.
Who can join, and when you have to leave
You can join the Flat Rate Scheme if your expected VAT-taxable turnover for the next 12 months is £150,000 or less, excluding VAT. For a contractor billing around £1,000 a day these limits arrive sooner than you might think, so it is worth checking each year rather than assuming FRS still applies.
Leaving works in two ways. On the anniversary of joining you check your total income including VAT for the year then ending, and must leave if it exceeded £230,000. There is a narrow way to stay on: apply to HMRC in writing and show that income for the next 12 months will not exceed £191,500, and that the excess was unexpected, has not happened before and will not happen again. Separately, if at any point you have reasonable grounds to believe your income for the next 30 days alone will exceed £230,000, you must leave from the start of that 30-day period, and nothing saves you there.
Some key exclusions. You cannot join if you have used and left the scheme in the previous 12 months, if your business is closely associated with another business, if you have been in a VAT group or registered for VAT as a division of a business in the last 24 months, or if you have been convicted of a VAT offence or accepted a compound penalty offer in lieu of prosecution in the last 12 months. You are also out if you use a margin scheme, are required to use the Tour Operators Margin Scheme, or have to operate the Capital Goods Scheme for certain capital items. And once you leave, you cannot rejoin for 12 months, so treat a switch to standard rate as a decision for at least a year, not something to reverse next quarter.
In your first year of VAT registration you get a 1 percentage point reduction on your flat rate, so the 14.5% IT consultancy rate becomes 13.5%. It applies to the limited cost rate too, so 16.5% becomes 15.5%. The discount runs from the date you register for VAT, not from the date you join the scheme, and it applies until the day before the first anniversary of registration. If you join FRS six months after registering, you get six months of discount, not twelve.
One catch: you do not get the reduction at all if you registered for VAT more than 12 months late. And claiming it past the first anniversary is one of the errors HMRC lists as common on flat rate returns.
What actually counts as flat rate turnover
The percentage is only half the calculation. What you apply it to matters just as much, and this is where contractors overpay without realising.
Generally included: the VAT-inclusive value of your standard-rated, reduced-rated and zero-rated supplies, plus exempt income. Zero-rated and exempt income go into the base, so you pay the flat rate on income you charged little or no VAT on. If either is a meaningful share of your turnover, FRS can cost you money.
Excluded: non-business income, supplies outside the scope of UK VAT, and specified items such as certain capital-asset disposals. Services to a business customer established outside the UK are generally outside the scope under the place of supply rules, so that income never enters the calculation. Bank interest is also outside it. Special rules apply to reverse-charge transactions, imports and Northern Ireland and EU goods movements.
Being excluded is not the same as being an advantage. Outside-the-scope income generates no flat rate surplus, because you charged no VAT on it in the first place, while you still give up input VAT recovery across all your costs. So a contractor billing heavily overseas tends to find FRS less attractive than the arithmetic below, not more.
Two related mechanics. Services you buy from outside the UK under the reverse charge sit outside FRS: exclude them from flat rate turnover and account for the VAT in boxes 1 and 4, with the values going in boxes 6 and 7 in the normal way. And you cannot use FRS at all for supplies caught by a UK domestic reverse charge, which includes construction services under the Construction Industry Scheme (CIS). That is a real constraint for construction and building-services contractors, not a technicality.
A common misunderstanding: the scheme simplifies how you calculate what you owe, not what you put on an invoice. You must still issue proper VAT invoices to VAT-registered customers showing VAT at the normal rate for the supply, 20% for most contracting work, never at your flat rate percentage. The flat rate is applied afterwards, to the VAT-inclusive total of everything you supplied in the period.
The FRS calculation: a worked example
An IT contractor with £100,000 annual turnover (excluding VAT) on FRS at 14.5%:
| Item | Amount |
|---|---|
| VAT charged to clients (20%) | £20,000 |
| Gross turnover including VAT | £120,000 |
| FRS payment to HMRC (14.5% × £120,000) | £17,400 |
| Surplus vs the VAT charged | £2,600 |
Read that £2,600 carefully: it is the gap between the VAT you charged and the VAT you handed over, not your saving. Under FRS you give up input VAT recovery, so the real comparison is against what you would have paid on standard rate, which is lower than £20,000. On the cost profile used later in this guide the true advantage is £2,200, not £2,600.
Even at £2,200 this looks attractive for no extra work. But there is a catch.
The limited cost business rule
HMRC introduced this test in 2017 specifically to prevent low-cost service providers from benefiting too generously from FRS. Its formal name is a limited cost business, though most accountants say limited cost trader. The words that carry the whole test are relevant goods, and they mean something much narrower than "costs", or even than "goods" in the everyday sense. Under the rule you are a limited cost business, and must use an FRS rate of 16.5% regardless of your sector, if your spending on relevant goods including VAT is either:
- less than 2% of your VAT flat rate turnover (the VAT-inclusive figure the flat rate is applied to); or
- more than 2% of that figure, but less than £1,000 a year.
Put the other way round: you escape 16.5% only if your relevant goods spend clears both hurdles.
One qualification on every 16.5% in this section: in your first year of VAT registration the 1 percentage point reduction applies to the limited cost rate as well, so you pay 15.5%. That is 18.6% of net sales rather than 19.8%, which is enough to make FRS the better answer for some contractors in year one and the worse answer from year two.
The limited cost business test is checked every VAT return
This is the part contractors miss. Limited cost trader is not a status you settle once when you join the scheme: you apply the test to each VAT return period separately, and your rate moves with it. The £1,000 a year works out at £250 for a standard quarter, pro-rated for any period that is not a full quarter.
In practice the 2% is almost always the binding test. On £30,000 of flat rate turnover in a quarter you would need more than £600 of relevant goods to clear it, well past the £250. Spend £700 on materials in one quarter and £50 the next, and you are on your sector rate for the first and the limited cost rate for the second, on the same contract, with nothing else about the business changed.
16.5% sounds close to the 20% you charge, so it is easy to underestimate. But it is applied to your VAT-inclusive flat rate turnover, not your net sales. Gross turnover is 120% of net, so 16.5% × 1.20 = 19.8% of net sales. Invoice £100,000 net (£120,000 including VAT) and you hand HMRC £19,800 of the £20,000 you charged: a £200 gap, and you gave up input VAT recovery to get it. In your first year of registration the rate is 15.5%, so the same figures give £18,600 and a £1,400 gap.
That gap widens pound for pound with your costs. On £2,000 of VAT-bearing costs you forgo £400 of input VAT and end up about £200 worse off than standard rate; on £6,000, about £1,000 worse off. The more you spend, the more the scheme costs you.
Relevant goods are supplies of goods used exclusively for the business, normally items where ownership passes to you: stationery and other office supplies, cleaning products, stock and raw materials. HMRC also treats water and any form of power, heat, refrigeration or ventilation as goods, though not if you hire in the equipment that provides it, which is a service. The exclusively for the business test is what bites for home-based contractors: electricity supplying a house that contains your office is not exclusive to the business and does not count, whereas power used in separate business premises can.
The following do NOT count as relevant goods:
- Software subscriptions and anything downloaded or supplied electronically (Adobe Creative Cloud, Microsoft 365): these are services. Off-the-shelf software on a physical disk does count, which is rare enough now to be a curiosity rather than a strategy.
- Professional subscriptions (ICAEW, LinkedIn premium): services
- Travel and accommodation: services
- Postage and stamps: these are payments for services, not goods, despite arriving as physical items
- Food or drink for you or your staff: excluded even though physical
- Capital expenditure goods of any value, which is where laptops, phones and similar equipment normally fall
- Rent, accountancy fees, advertising, and anything leased or hired: services, because ownership never transfers to you
- Most vehicle costs and fuel, unless you are in the transport business, and promotional gifts
- Anything bought purely to pass the test: see below
The obvious move is to spend £1,000 on stationery and escape the higher rate. HMRC closed that off: goods bought solely to meet the test are not relevant goods, because they are not used exclusively for the purposes of the business. HMRC's own example is a quantity of office materials the business cannot reasonably use, stockpiled or thrown away, even where it would normally buy those same items in smaller amounts. Buying what you genuinely need is fine. Buying to move a percentage is not, and the money is wasted twice over.
For most service contractors, genuine relevant goods spend is minimal: a few pounds of stationery a year, if that. This means most contractors are limited cost businesss by default, even if they spend thousands on business costs.
Capital purchases do not help you escape limited cost business status, because they are excluded from the goods test. But a separate rule does help: on a single purchase of capital goods costing £2,000 or more including VAT, you reclaim the input VAT in the normal way, even on FRS.
Single purchase is what catches people. A £2,400 laptop from one supplier qualifies. £2,400 of kit from three suppliers across three months is three purchases, and none of them do. A machine bought together with its monitor and peripherals from one supplier counts as one.
How you pay for it matters too. Leasing or hiring never qualifies, because ownership never transfers and HMRC treats it as one continuous supply of services. Hire purchase can qualify, because ownership does eventually pass to you. And when you later sell an asset you reclaimed VAT on, you account for output VAT outside the flat rate calculation, at the rate appropriate to that sale rather than at your flat rate.
| Contractor | Annual relevant goods spend | 2% of flat rate turnover (£120,000) | Limited Cost Business? | FRS Rate |
|---|---|---|---|---|
| IT consultant, mostly software tools | £0 (software = services) | £2,400 | Yes, below 2% and £1,000 | 16.5% |
| UX designer, buys drawing tablets | £0 (tablets are electronic devices: capital, excluded) | £2,400 | Yes, no qualifying goods at all | 16.5% |
| Engineering consultant, buys PPE and materials | £3,500 | £2,400 | No, above both the 2% and £1,000 tests | 14.5%* |
*Assumes the engineering consultant falls within "Architect, civil and structural engineer or surveyor"; other engineering consultancy may sit in "Business services not listed elsewhere" at 12%, so check the sector list before relying on a rate. PPE and materials count only if used exclusively for the business and not bought to pass the test, and construction services caught by the domestic reverse charge cannot go through FRS at all.
FRS at 16.5%: is it still worth it?
For a limited cost business on 16.5% FRS, the surplus compared to standard rate narrows dramatically:
| Scenario | FRS at 14.5% | FRS at 16.5% | Standard Rate |
|---|---|---|---|
| VAT charged (£100k net turnover) | £20,000 | £20,000 | £20,000 |
| Paid to HMRC before input VAT | £17,400 | £19,800 | £20,000 |
| Input VAT reclaimed (on £2,000 net of VAT-able costs) | £0 (not reclaimable on FRS) | £0 (not reclaimable on FRS) | −£400 |
| Net VAT to HMRC | £17,400 | £19,800 | £19,600 |
| Annual position vs standard rate | +£2,200 better | −£200 worse | Baseline |
Both FRS columns are measured against the same standard-rate baseline of £19,600, which is why the 14.5% figure is £2,200 rather than the £2,600 gross surplus in the earlier example. The £400 difference is the input VAT you give up on the scheme, and it scales with your costs.
At 16.5% of VAT-inclusive turnover, which is 19.8% of your net sales, FRS hands over slightly more than standard rate for a typical limited cost business, and most IT and consultancy contractors are limited cost businesss. The £200 in the table is small in cash terms, but it points the wrong way, and standard rate also leaves you free to reclaim on whatever you buy next.
That is a strong default, not a universal answer. FRS at your sector rate is genuinely better if your relevant goods spend clears both tests period after period, and better again if a real share of your income is outside the scope of UK VAT. Run your own figures before you choose, and look again if your costs or client mix change.
Common VAT mistakes contractors make
- Missing the registration deadline: the rolling 12-month test catches contractors off-guard. Monitor your cumulative turnover against £90,000 monthly.
- Staying on a sector rate after becoming a limited cost business: your cost profile moves, and so does the rate. Check the limited cost test for each VAT return period.
- Treating recharged expenses as disbursements: recharged expenses are normally part of your own supply and follow its VAT treatment, whether or not you add a mark-up. A payment sits outside your VAT calculation as a disbursement only where the strict conditions are met, including that your client received the underlying supply and was legally responsible for paying for it, and that you itemise the exact amount separately. Paying at cost is not enough on its own.
- Misreading the de-registration test: it is forward-looking. You can apply to de-register when you expect taxable turnover for the next 12 months to be below £88,000, not simply because the last 12 came in under it. Two things to watch on the way out: VAT may be due on stock and assets you still hold, and on FRS you leave the scheme the day before your de-registration date.
- Applying the flat rate to net rather than gross turnover: HMRC lists this among the most common errors on flat rate returns. The percentage goes on the VAT-inclusive figure.
- Place of supply errors for overseas clients: services to a business customer outside the UK are generally outside the scope, which changes both your registration threshold calculation and, on FRS, your flat rate turnover. Worth advice if you have non-UK business clients.
Practical setup: MTD for VAT
VAT-registered businesses must normally keep digital records and file VAT returns through compatible software under Making Tax Digital (MTD), unless HMRC has granted an exemption. Exemptions are narrow and have to be applied for: broadly, where it is not reasonably practicable for you to use digital tools because of age, disability, location or religious grounds. FreeAgent was on HMRC's list of compatible software as at August 2026 and submits quarterly returns directly to HMRC; check HMRC's current list before relying on any particular package. If you're registered for VAT and your bookkeeping is up to date, quarterly submission is largely automated.
VAT returns are typically due one month and seven days after the end of each quarter. A quarterly filing cycle is standard; monthly filing is available (and sometimes beneficial) for businesses that regularly receive VAT refunds.
If you want to see what the two schemes look like on your own numbers first, the VAT: Flat Rate vs Standard calculator runs the comparison in your browser, and the 2026/27 tax rates page has the thresholds in one place.
Not sure which VAT scheme is right for you?
If you are VAT registered, or heading for the threshold, we compare Flat Rate against standard rate on your own turnover, cost profile and client mix when you join us, and revisit it as your costs change. VAT returns are included in the Standard and Premium packages.
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