The VAT Flat Rate Scheme lets many small VAT-registered businesses work out VAT due by applying a fixed percentage to VAT-inclusive turnover instead of deducting input tax on most purchases, though HMRC warns you may pay more VAT than under standard accounting because the percentages are averages. VAT Notice 733 states the scheme is for businesses whose forecast taxable turnover excluding VAT is £150,000 or less in the next year, subject to association rules and other exclusions. Tradespeople choose the sector rate that most closely matches expected work for the year ahead using the published GOV.UK list, unless limited cost business rules force 16.5%. You cannot use the Flat Rate Scheme for supplies subject to a VAT domestic reverse charge, which matters for many construction chains. Normal VAT invoice rules still apply to customers.
This guide summarises public GOV.UK and HMRC notice guidance. It is practical commentary only and is not tax or legal advice. Confirm your facts with HMRC or a qualified United Kingdom tax adviser.
Context
Flat rate changes how you calculate VAT payable to HMRC, not whether you must show VAT properly on customer paperwork. Limited cost rules, turnover ceilings, association tests, and reverse charge supplies can all pull you back to standard VAT accounting for part or all of your income.
VAT Notice 733 explains that the Flat Rate Scheme is designed to simplify your records of sales and purchases and allows you to apply a fixed flat rate percentage to your gross turnover to arrive at the VAT due (HM Revenue and Customs, VAT Notice 733: Flat Rate Scheme for small businesses).
The notice states you can apply if your business is not associated with another in the way HMRC defines, your taxable turnover excluding VAT in the next year will be £150,000 or less, and you are eligible to be registered for VAT (HM Revenue and Customs, VAT Notice 733).
VAT Notice 733 directs readers to GOV.UK flat rate guidance and states that if you are a limited cost business you should use the flat rate of 16.5%, with a calculator on GOV.UK to test the position (HM Revenue and Customs, VAT Notice 733; GOV.UK, VAT Flat Rate Scheme).
VAT Notice 733 states you cannot use the VAT Flat Rate Scheme for supplies of goods and services that are subject to one of the VAT domestic reverse charges, and signposts VAT Notice 735 plus building and construction guidance (HM Revenue and Customs, VAT Notice 733).
ICAEW Tax Faculty explains that a business must register for VAT if its taxable supplies for the last twelve months are more than £90,000, or it expects its taxable supplies to exceed £90,000 in the next thirty days, and that voluntary registration remains possible, which is the backdrop when trades compare standard accounting with the Flat Rate Scheme after registering (ICAEW Tax Faculty, Economy explainers: what is VAT?, 17 October 2025).
Brian Berry, Chief Executive of the Federation of Master Builders, said in February 2021 that reverse charge VAT is a damaging policy being introduced at the worst possible time for builders, and that by removing the flow of VAT money between businesses in the construction supply chain, four in ten builders say this will have a significant or moderate impact on their cashflow (Federation of Master Builders, press release, 16 February 2021).
Sources
These points come from VAT Notice 733 and GOV.UK. They anchor turnover tests, limited cost percentages, and reverse charge boundaries before you change invoicing habits.
VAT Notice 733 states that as the flat rates are averages, you may pay more VAT on the Flat Rate Scheme than you would on normal accounting (HM Revenue and Customs, VAT Notice 733).
HM Revenue and Customs, VAT Notice 733 (2025). View source
The same notice explains that if you use the Flat Rate Scheme, you do not recover input tax or VAT on imports, and that if your business is in Northern Ireland, you cannot recover VAT on acquisitions from the EU (HM Revenue and Customs, VAT Notice 733).
HM Revenue and Customs, VAT Notice 733 (2025). View source
VAT Notice 733 states you will cease to be eligible to use the scheme if the total value of your income for the year ending is more than £230,000, while noting a lower £191,500 figure where HMRC may let you remain if satisfied about the next twelve months (HM Revenue and Customs, VAT Notice 733).
HM Revenue and Customs, VAT Notice 733 (2025). View source
Workflow
Confirm eligibility and sector choice, apply through HMRC’s published route, label invoices correctly, split reverse charge income from flat rate turnover, and review limited cost status each VAT period.
Work through paragraph 3 in VAT Notice 733 so you understand associated business blocks and how to forecast taxable turnover for the next year. Keep the working papers HMRC expects if forecasts are challenged later.
If limited cost rules apply, Notice 733 expects 16.5% rather than the trade sector table on GOV.UK. Run the GOV.UK calculator and file the outcome with your internal controls.
Tip: If limited cost status applies, Notice 733 notes you may pay more VAT than on standard accounting, so model both methods with your accountant.
VAT Notice 733 explains the flat rate depends on the sector that most closely describes what your business will be doing in the coming year, with further detail on GOV.UK flat rate pages (HM Revenue and Customs, VAT Notice 733).
Notice 733 points VAT-registered businesses to form VAT600FRS unless you already applied for the scheme during VAT registration, and explains how to combine applications with the Annual Accounting Scheme using VAT600AA when needed (HM Revenue and Customs, VAT Notice 733).
Follow Notice 733 and the VAT domestic reverse charge technical guide so construction and other reverse charge supplies are excluded from flat rate calculations and are invoiced with the wording HMRC requires.
Flat rate changes your VAT payment calculation, not the need for compliant sales documents. Keep sequential numbering, sterling totals, VAT registration number display, and rate narrative consistent with your customer’s need to reclaim input tax where allowed.
Notice 733 states that if you are in your first year of VAT registration you get a 1% reduction in flat rate percentage until the day before your first anniversary of becoming VAT registered, and that the entitlement runs for the twelve months following the date of VAT registration, not the date you join the Flat Rate Scheme (HM Revenue and Customs, VAT Notice 733).
Notice 733 expects you to check turnover at least once a year on the anniversary of joining and to leave the scheme when income limits or eligibility tests fail, completing split calculations if you exit mid-period (HM Revenue and Customs, VAT Notice 733).
Checklists
Use these lists to keep flat rate elections, domestic reverse charge jobs, and invoice templates aligned.
Pitfalls
Most pain comes from mixing reverse charge jobs with flat rate turnover, forgetting limited cost status, or treating flat rate as an excuse to issue vague invoices.
Problem
Notice 733 excludes reverse charge supplies from the scheme. Including them corrupts both VAT paid to HMRC and customer expectations.
Fix
Tag construction and other reverse charge sales in your ledger, follow Invoice Mama’s domestic reverse charge construction guide, and exclude those values from flat rate turnover per HMRC technical guidance.
Problem
HMRC expects the sector that most closely matches the larger part of your business. Aggressive sector shopping risks assessments.
Fix
Review job costing categories each anniversary of joining and move percentages when the balance of work changes, as Notice 733 describes.
Problem
Customers still need compliant VAT documentation to support their own claims. Omitted VAT lines or registration numbers slow payment.
Fix
Mirror the field checklist in Invoice Mama’s UK VAT invoice guide for every taxable supply outside reverse charge.
Problem
Notice 733 states you do not recover input tax or VAT on imports while using the scheme, which can erase margins on high-material jobs.
Fix
Price jobs with gross material costs in view and revisit whether standard accounting is cheaper when material intensity rises.
Practical answers for VAT-registered builders, plumbers, electricians, and other trades who use or consider the Flat Rate Scheme.
Yes when VAT Notice 733 eligibility tests are met, including the £150,000 forecast turnover ceiling excluding VAT and non-association rules. Sole traders still need compliant invoices and Making Tax Digital records unless HMRC exempts them.
GOV.UK publishes flat rate percentages for types of business, and VAT Notice 733 directs you to that list when you are not a limited cost business (GOV.UK, VAT Flat Rate Scheme; HM Revenue and Customs, VAT Notice 733).
VAT Notice 733 states limited cost businesses must use 16.5% and points to the GOV.UK calculator to test goods costs in the relevant period (HM Revenue and Customs, VAT Notice 733).
You still account for VAT on taxable supplies in the way HMRC requires for each transaction type. Domestic reverse charge supplies follow reverse charge invoicing instead of you charging VAT in the usual way when conditions are met. For other taxable sales, customers expect normal VAT invoices with clear totals.
VAT Notice 733 explains how to apply for both using the combined forms HMRC publishes, so you can align fewer VAT Returns with flat rate calculations when eligible (HM Revenue and Customs, VAT Notice 733).
Notice 733 allows a 1% reduction in your flat rate percentage during the first twelve months following VAT registration, subject to the examples in the notice about late registration and join dates (HM Revenue and Customs, VAT Notice 733).
Notice 733 sets out when you must leave the scheme, including when annual VAT-inclusive income passes £230,000 and when a £191,500 forward test might let you stay. Leaving mid-period requires split calculations on the next VAT Return (HM Revenue and Customs, VAT Notice 733).
VAT Notice 733 states that if your business is in Northern Ireland, you cannot recover VAT on acquisitions from the EU while using the Flat Rate Scheme, so cross-border purchasing plans need extra review (HM Revenue and Customs, VAT Notice 733).
Start with Invoice Mama’s United Kingdom domestic reverse charge construction guide, then read HMRC Notice 735 and the building and construction service guidance GOV.UK hosts.
ICAEW Tax Faculty material explains broad VAT concepts for businesses approaching registration, while a Chartered Accountant or tax adviser can model your purchases, sector mix, and reverse charge exposure with live numbers (ICAEW Tax Faculty, Economy explainers: what is VAT?).
Keep learning
United Kingdom VAT registration, invoice fields, and construction schemes sit beside Australian comparisons when you trade overseas.
GOV.UK £90,000 tests, thirty-day expectation rule, HMRC online registration, and first VAT invoice timing.
Read guideMandatory fields, simplified invoices, electronic invoicing, and sterling presentation aligned with HMRC notices.
Read guideCIS-linked reverse charge, invoice wording, and why those supplies sit outside flat rate turnover.
Read guideVerification, deductions, and statements when you combine CIS labour with VAT decisions.
Read guideTrading name display, optional VAT lines before registration, and professional billing habits.
Read guideAustralian turnover tests and BAS rhythm when you also run jobs for Australian customers.
Read guideReminder cadence ideas you can adapt for United Kingdom customers with local terms.
Read guideFrom flat rate to paid
Invoice Mama helps you issue branded invoices with sterling VAT lines, sequential numbering, and consistent wording while you apply HMRC flat rate percentages and file VAT Returns through Making Tax Digital.