OverpaymentSense™ — Free HMRC Refund Checker

Free refund check

OverpaymentSense™ Refund Checker

Check whether HMRC may owe you additional tax refunds from previous returns.

Step 1 · Your tax year

Which tax year would you like us to check first? You can review up to four previous years in total.

Tax year

Step 2 · Your figures

Enter the figures from your tax return. Rough estimates are fine — we'll confirm exact numbers when we run the full review.

CIS / gross income (£)

CIS deducted at source (£)

Total expenses claimed on the return (£)

Travel, tools, PPE, professional fees, mileage, accommodation — combined total.

Step 3 · A few quick questions

These help our engine identify overpayment patterns most workers don't realise they're entitled to claim back.

Did you claim every single work-related expense you incurred?

Yes — every one No / not sure

Did you claim business mileage in your personal vehicle?

Yes No / didn't track it

Were you on an emergency tax code at any point that year?

Yes No

Did you have more than one job / contractor that year?

Yes No

Your estimate

Estimated overpayment opportunity

£500–£1,500

Indicative range only · subject to HMRC review

Why we think this

Choose how you want to proceed

Software · DIY

Self-Serve Pack

£29/year

Use the OverpaymentSense™ tools and templates to prepare your claim pack yourself.

Refund checker (this tool)
HMRC-ready letter templates
Evidence checklist generator
Portal access

Assisted

Assisted Review

£99 · one-off

Our team reviews your figures and evidence using SmartScanit, then guides the strongest claim approach.

Everything in Self-Serve
Specialist review of your figures
30-min consultation
Letter customisation guidance

Done-For-You

Full Pack Completion

No win, no fee

We prepare the full Overpayment Relief pack — calculations, evidence, HMRC-ready letters — and walk it to submission.

Everything in Assisted
Full claim pack prepared
HMRC letter ready to sign
Submission support
Fee only on success

You chose: Assisted Review

Last step — your contact details so a specialist can pick this up within one working day.

Full name

Mobile

I agree to be contacted about my overpayment estimate. See our privacy policy.

Compliance note: OverpaymentSense™ provides software-led tools and structured preparation support. Estimates are indicative only and do not guarantee any refund. Claims are submitted by the taxpayer (or by our team with written authorisation), and outcomes depend on HMRC review.

Request received — thank you.

A specialist will be in touch within one working day to walk you through your estimate and confirm next steps. Your estimate range and chosen plan are with our team.

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Three ways to claim

Pick the level of support that fits

Whether you're confident DIY or want us to do the heavy lifting — OverpaymentSense™ scales to where you are.

DIY · Software

Self-Serve Pack

Annual portal access. Build your own Overpayment Relief pack using our tools and templates.

Unlimited refund checks
HMRC letter templates
Evidence checklist
Step-by-step guide

£29/year

Start Free Check

Assisted

Assisted Review

A specialist reviews your figures and evidence using the SmartScanit Sense Engine before you submit.

Everything in Self-Serve
Specialist figure review
30-minute consultation
Letter customisation

£99 · one-off

Request Assisted Review

Done-For-You

Full Pack Completion

We prepare the entire Overpayment Relief pack — figures, evidence, HMRC letters — and support submission.

Everything in Assisted
Full pack prepared by us
HMRC-ready letters
Submission support

No win, no fee

Start Sign-Up

Important

How OverpaymentSense™ works compliantly

OverpaymentSense™ is a software-led service. We provide tools, templates and structured preparation support powered by the SmartScanit Sense Engine™.

Claims are submitted by the taxpayer (or by our team only with your written authorisation). Estimates produced by the checker are indicative — final amounts depend on HMRC's review of the figures and evidence submitted.

Maximum Rebate is ICO-registered, GDPR-compliant, and all credentials are encrypted in transit and at rest.