How much of my CIS deductions can I reclaim?

It depends on your total income and expenses. CIS deductions at 20% or 30% are advance payments against your final tax bill. If your actual liability is lower than what was deducted, you get the difference back. TaxGo calculates this and shows you the figure.

What if I lost some of my CIS statements?

Your contractors must provide monthly statements, so ask them for copies. Your HMRC online account also shows CIS deductions reported by contractors. Upload whatever you have and TaxGo will flag any gaps.

Can I claim expenses as a CIS subcontractor?

Yes — if you're self-employed, you can claim allowable expenses like tools, travel to temporary sites, protective clothing, vehicle costs and materials. TaxGo categorises your expenses and deducts them from your taxable profit.

CIS subcontractors

Deducted atsource.Back to you.

Upload your CIS statements and TaxGo extracts gross payments, materials and deductions from every contractor, then works out your refund or balance.

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Your documents

Illustrative

CIS statement · Apex Build Ltd
Deducted · £2,880
CIS statement · Northgate Homes
Deducted · £4,320
Expense receipts
Tools & travel · £4,100

Your TaxGo return · 2025/26

Self-employment

Gross payments£38,400

Materials & expenses−£6,500

Profit£31,900

CIS deductions

Tax already deducted£7,200

Estimated refund£2,174.20

Illustrative 2025/26 estimate: income tax plus Class 4 NI, less CIS deducted.

What you'll need

The documentsTaxGo readsfor you.

PDF, photo or scan. Don't rename them, don't sort them. Just drop them in.

CIS payment statements
Monthly statements from each contractor showing gross pay, materials and deductions
Invoices to contractors
Your invoices showing labour charges and materials supplied
Expense receipts
Receipts for tools, travel, materials and other allowable costs

How TaxGo handles it

01
Your refund, worked out
CIS deductions are advance payments of tax. TaxGo totals every deduction across every contractor and works out exactly what you get back — or what's still owed.
02
Multiple contractors
Worked for several contractors? Upload each one's statements. TaxGo consolidates gross payments, materials and deductions into one return.
03
Materials separated
If you supply materials, TaxGo separates labour from materials correctly, so your profit and deductions line up with your statements.
04
CIS + self-employment combined
CIS income often sits alongside other self-employed work. TaxGo handles both on the same return, with income, expenses and Class 4 NI calculated across all of it.

What we support

Covered.Properly.

If your return needs something TaxGo doesn't handle yet, we tell you before you pay.

Everything TaxGo supports →

CIS payment and deduction statements
Multiple contractor deductions
Gross payment and materials extraction
CIS tax deducted reclaim
Self-employment expenses alongside CIS
Class 4 National Insurance
Combined with other income sources
Contractor details checked across statements

Common questions

Asked andanswered.

It depends on your total income and expenses. CIS deductions at 20% or 30% are advance payments against your final tax bill. If your actual liability is lower than what was deducted, you get the difference back. TaxGo calculates this and shows you the figure.

Your tax return isn't going to do itself.

Actually, TaxGo gets pretty close.

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