How much is the missing paperwork worth to HMRC?

Prices the zero-rated disabled-relief sales you cannot prove, before an HMRC officer does

Orders with no declaration, inside the window—orders
Years HMRC can still assess—years
Net sales value at risk—GBP
VAT HMRC can assess—GBP
Inaccuracy penalty—GBP
Late-payment interest—GBP
Total exposure—GBP
Cost of one missing declaration—GBP
Take this working with you.
CSV export of every input and every line above for your accountant or an HMRC disclosure, plus a recheck reminder before your next VAT return. $60 once · one licence key per person or team seat · 7-day full refund. The average UK VAT consultant is paid GBP 22 an hour (Glassdoor, March 2026) and a practice bills that time out at several times the rate.
Get CSV export and reminders — $60 →
Missing-declaration exposure
Turns a count of zero-rated orders and the share with no signed eligibility declaration into the VAT, penalty and interest one HMRC assessment would carry.
4-year assessment window
Scales the order count down to the four years HMRC can still assess under s.77 VATA 1994, so a six-year sales history is not priced as if all of it were at risk.
Schedule 24 penalty band
Applies the inaccuracy penalty band you pick - careless unprompted, careless prompted or deliberate prompted - to the VAT rather than to the sale value.
Late-payment interest clock
Adds simple interest at the HMRC rate for the months since the affected return was due; the rate has been Bank of England base plus 4% since 6 April 2025.
CSV export of the working
Writes every input and every line of the calculation to a .csv you can hand to your accountant or attach to a disclosure. Needs the $60 key.
Quarter-end recheck reminder
Sets a reminder to re-run the check before the next VAT return is filed, so the gap is found by you and not at inspection. Needs the $60 key.

Get the complete version $60

This page is the working piece. The full pack has everything below.

Prices the zero-rated disabled-relief sales you cannot prove, before an HMRC officer does

The average UK VAT consultant is paid GBP 22 an hour (Glassdoor, March 2026) and a firm bills that time out at several times the rate; hand-checking 240 orders against signed declarations is most of a working day.

Buy the full version — $60

Questions people ask

What does this extension actually work out?

It prices the zero-rated sales you cannot prove. You fill eight boxes: order count, the share with no signed declaration, average net order, VAT rate, years of history, months since the return was due, penalty band and interest rate. It returns eight lines, including the VAT HMRC can assess, the Schedule 24 penalty, the interest, the total and what one missing form costs.

Who is this for?

UK retailers who zero-rate goods for chronically sick or disabled customers under VAT Notice 701/7: mobility and stairlift dealers, incontinence and daily-living-aid suppliers, adapted-vehicle converters, and the bookkeepers and accountants who file their VAT returns and get asked how bad a missing declaration really is.

Why will a chatbot or a free VAT calculator not do this?

A generic VAT calculator adds 20% to one sale. A chatbot does not know your order count, your missing-declaration rate, or that HMRC can reach back four years under s.77 VATA 1994, and it applies the penalty to the sale value rather than to the VAT. This tool compounds all four in the order an assessment does.

What is free and what needs the key?

Every calculation is free, unlimited and needs no key: the popup and the web page give you the full exposure and the per-declaration cost. The $60 licence key adds ownership and repetition - CSV export of the whole working for your accountant or a disclosure, and a recheck reminder before your next return.

What would it cost to have a person do this?

The average UK VAT consultant is paid about GBP 22 an hour according to Glassdoor in March 2026, and a practice bills that time out at several times the rate. Matching 240 orders to signed declarations and pricing the gap by hand is most of a working day, before anyone writes the disclosure.

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