A VAT return can feel like one more deadline competing for attention when you are already serving customers, chasing invoices and keeping the business moving. The good news is that once your records are up to date, learning how to submit VAT online is usually a clear, repeatable process – not something that needs to take over your week.
For most VAT-registered businesses, returns must be filed through Making Tax Digital-compatible software. The key is not leaving the preparation until the final day. A few sensible checks before you submit can protect your cash flow, reduce the risk of errors and give you confidence that your figures are right.
What you need before submitting a VAT return online
Before opening your accounting software, make sure you have completed the bookkeeping for the VAT period. This means recording sales invoices, supplier bills, expenses and any bank transactions that affect VAT. If a receipt is missing or a purchase has been entered twice, it is far easier to deal with it before the return goes to HMRC.
You will also need software that is compatible with Making Tax Digital for VAT. Many small businesses use cloud accounting packages such as Sage or QuickBooks, although the best option depends on how you invoice, pay suppliers and manage your records. Your software needs to be connected to HMRC and authorised to submit on your behalf. In many cases, this involves using your Government Gateway details during the initial set-up.
Have your VAT registration number and your VAT accounting scheme to hand as well. The figures can be treated differently depending on whether you use the standard scheme, Flat Rate Scheme, cash accounting or annual accounting. For example, businesses using cash accounting generally account for VAT when money is paid or received, rather than when the invoice is raised.
How to submit VAT online step by step
The actual submission is often quick. The preparation is where most of the care is needed.
1. Check that every transaction is in the right VAT period
Start by reviewing the date range on your VAT return. A quarterly return normally covers three months, but your exact periods are set by HMRC. Check that all sales and purchases dated within that period have been entered, and that transactions from the previous or following period have not slipped in by mistake.
If you work with a bookkeeper, agree a cut-off date for sending over receipts, supplier invoices and sales information. This small habit prevents last-minute uncertainty and makes your figures much more reliable.
2. Reconcile your bank and review unpaid items
Your bank balance in the software should match your actual bank statement once all relevant transactions have been reconciled. This is one of the best ways to spot missing payments, duplicated entries or personal spending accidentally recorded as a business cost.
Then review unpaid sales invoices and supplier bills. Whether they affect this return depends on your VAT scheme, so do not simply delete or alter them to make the report look tidy. The correct treatment matters more than a quick fix.
3. Review the VAT return figures
Your software will normally prepare the nine boxes of the VAT return for you. It is still worth looking at the figures rather than clicking submit automatically.
Pay particular attention to Box 1, which shows VAT due on your sales, and Box 4, which shows VAT you are reclaiming on purchases. The difference between them determines whether you owe VAT or are due a repayment. A sudden increase in VAT due may be completely reasonable after a busy quarter, but it could also point to an expense coded without VAT or a sales invoice entered incorrectly.
Also check that any zero-rated, exempt or outside-the-scope income has been coded correctly. These terms sound similar, but they do not always have the same VAT treatment. If you are unsure, it is better to ask before submitting than to make assumptions.
4. Make any corrections before filing
If you find an error, correct it in the underlying records rather than manually changing the VAT return total wherever possible. This leaves a clear audit trail and helps your bookkeeping remain accurate after the submission has been made.
Some adjustments, such as bad debt relief or certain fuel scale charges, may need additional attention. If your business uses the Flat Rate Scheme, check that the correct percentage has been applied and consider whether any changes in your business activity affect it. VAT is not always one-size-fits-all, especially as a business grows.
5. Submit through your MTD-compatible software
Once you are happy with the figures, use the VAT submission option within your software. You should receive confirmation that HMRC has accepted the return. Save this confirmation alongside your VAT records, either digitally or in your usual finance file.
Submitting the return and paying the VAT are related, but they are not exactly the same task. Your software may show the amount due, but you must still arrange payment using a method accepted by HMRC. Allow enough time for the payment to clear.
When is online VAT submission due?
For most businesses, the VAT return and payment must reach HMRC by the seventh day of the second month after the end of the accounting period. For a quarter ending 31 March, the usual deadline is 7 May.
There are exceptions. Businesses using annual accounting, payments on account or certain special arrangements can have different payment dates. Always check the deadline shown in your HMRC account or accounting software rather than relying on a date from a previous return.
Missing a deadline can lead to penalty points and, eventually, financial penalties. More importantly for many small businesses, a late return creates unnecessary stress. Put each VAT deadline in your diary as soon as your accounting period begins, with a reminder two or three weeks beforehand to finalise the books.
Common mistakes when submitting VAT online
Most VAT errors are not caused by complicated tax rules. They happen when records are rushed, incomplete or left unattended for too long. Common examples include claiming VAT on expenses where it cannot be reclaimed, entering gross figures as net figures, duplicating supplier bills, and using the wrong VAT code.
Another frequent issue is confusing business and personal purchases. If you are a sole trader or run a small limited company, it is especially useful to keep business spending separate through a dedicated bank account and business card. It makes the VAT review simpler and gives you a clearer view of what the business is actually spending.
Do not overlook the impact of credit notes, refunds and cancelled invoices either. These should be recorded correctly so that the VAT return reflects what was genuinely sold and paid for during the period.
What if you have already submitted an incorrect return?
Do not panic. Small VAT errors can often be corrected on a later return, subject to HMRC rules and limits. Larger errors, or mistakes that are deliberate or repeated, may need to be reported directly to HMRC instead.
The right approach depends on the amount involved, the type of error and whether it resulted in too much or too little VAT being paid. Keep clear records of what went wrong and how you corrected it. Trying to ignore an error usually creates a bigger problem later.
Make VAT a routine, not a quarterly scramble
The easiest way to submit VAT online with confidence is to keep your bookkeeping current throughout the quarter. Set aside regular time each week to upload receipts, raise invoices, reconcile the bank and deal with supplier bills. Ten or twenty minutes regularly is usually far less painful than sorting through a pile of paperwork before a deadline.
If you are short on time or never quite feel sure about the figures, personal support can make a real difference. Angel Bookkeeping & Payroll Services helps small businesses keep records organised, prepare VAT returns and understand what the numbers mean – with straightforward advice and no unnecessary jargon.
VAT should give you a regular picture of your sales, costs and cash position, not just a date to dread. With good records and a calm process in place, each return becomes one more job handled properly and on time.