How it works

Learn by doing the return — with a safety net under every box.

ReturnDeck isn't a quiz that grades you at the end. It's a live working return that reacts as you type, explains itself, and lets you try again until the method sticks.

01
Choose

Pick a return & a scenario

Choose CT600 or VAT, then start from a ready-made company case or type in your own figures from a real set of accounts. Nothing to install, no account needed.

Corporation Tax
CT600
Full computation
Value Added Tax
VAT
Key-box return
02
Fill

Fill the boxes — get answers instantly

As you type, each box checks itself. Totals like trading profit or net VAT due recalculate live, so you always see where a number lands.

Green — box checks out
!Pink — take another look
Turnover
480,000
Client entertaining
!2,400
Trading profit
£70,300
03
Hint

Peel a post-it when you're stuck

Every box has a hint behind it, written in plain English. Open one for a nudge on the rule — depreciation add-backs, disallowables, the personal allowance taper — without giving away the figure.

Hint
Depreciation is an accounting figure — HMRC ignores it. Add it back, then claim capital allowances instead.
Watch out
Client entertaining is never allowable — only staff entertaining up to £150/head.
04
Review

Check the worked solution, then go again

Reveal the full computation line by line, with the rule behind each adjustment. Reset the figures, change the scenario, and repeat until the method is automatic.

Worked solution
Operating profit73,600
+ Depreciation12,000
+ Entertaining3,200
− Capital allowances(18,500)
Trading profit70,300
No account, no install
Open a return in the browser and start typing straight away.
Real box references
Boxes are labelled like the actual CT600 and VAT return, so it transfers.
FY2024 rates built in
Marginal relief and the 19–25% bands are applied for you to check against.
See it in action.
Open a return and watch the boxes react as you type.