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Back Tax Calculation in Bexley

If you have unfiled years at a DA1 to DA18 address, the actual tax position is often a refund rather than a bill, because CIS deductions taken at source by contractors (20% on verified subcontractors) are usually higher than the actual tax due after allowable expenses.

As HMRC-registered accountants experienced with Bexley cases, we produce a clean year-by-year liability schedule (CIS deductions credited per year, Section 24 fractions for landlord cases, all reliefs identified) so you know exactly the position before deciding next steps.

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Bexley-Specific Back-Tax Items

CIS deductions as tax credits per year
HMRC holds the CIS deduction record for every contractor you worked for. Multi-year accumulated deductions often exceed actual tax due once allowable expenses are applied.
Section 24 fractions per year
Multi-year BTL cases spanning 2017-2020 need correct fraction per year (75/25, 50/50, 25/75, 0/100). Post-2022 Elizabeth Line corridor BTL acquisitions are squarely in the 100% credit regime.
Allowable business expenses
Van (capital allowances or simplified mileage), tools, work clothing, PPE, training, public liability insurance, accountancy fees, business proportion of mobile phone.
Mixed PAYE / self-employed reconciliation
For Bexley logistics workers with mixed bases, RTI captures the PAYE side; self-employed income calculated separately per year.

CIS Refund Position Calculation

For Bexley CIS subcontractors, the back-tax calculation per year:

  1. 1
    Gross income reconstructed
    From bank deposits (net of CIS) plus contractor pay summaries.
  2. 2
    Allowable expenses applied
    Van, tools, work clothing, training, insurance, accountancy fees.
  3. 3
    Net trading profit calculated
    Personal allowance applied; tax due calculated at the appropriate band.
  4. 4
    CIS deductions credited
    HMRC-held CIS data applied as tax already paid for that year.
  5. 5
    Refund or balancing payment per year
    For most Bexley CIS cases with consistent allowable expenses, the calculation produces a refund.

Elizabeth Line BTL Back-Tax

For Elizabeth Line corridor (Abbey Wood, Belvedere, Slade Green, Plumstead) BTL landlords with unfiled years post-2022, Section 24 is fully bedded in (100% credit only). The back-tax calculation includes: gross rental income, allowable expenses (agent fees, repairs, insurance, mortgage interest as 20% credit, ground rent), capital allowances on furniture / replacements where applicable, capital gains on any disposal completed within the unfiled period (60-day standalone CGT return for residential disposals).

Bexley back tax calculation: Common Questions

Frequently Asked Questions

HMRC holds the authoritative CIS deduction record reported by every contractor. Our team requests this under 64-8; the figures are HMRC-verified by definition. Bank deposits provide the corresponding net-of-CIS income side; reconciliation is straightforward.

Bexley at a Glance

Postcodes
DA1, DA5 to DA8, DA14 to DA18
HMRC office
Stratford regional centre (London admin)
Tribunal centre
Taylor House EC1R
Council
London Borough of Bexley
See Bexley location page

Often a Refund

Bexley CIS subcontractors with multi-year unfiled cases often have refund positions once allowable expenses are correctly applied against deductions taken at source.

Get Your Bexley Back-Tax Calculation

Free initial consultation. Our team produces a year-by-year liability schedule with CIS deductions and reliefs correctly applied per year. Often a refund. We reply within 48 hours with a fixed written quote.

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