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Fastyr mie — good afternoonJecrean 14 Jerrey Fouyir 2026Wednesday, 14 October 2026

Useful things for island life

Tools.

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Personal & self-employed

What’s left after tax?

Choose your situation, add your income and see the annual breakdown.

2026/27 & 2025/26
Rules checked 11 October 2026

Your situation

Married couples, allowance sharing and family claims ↓
Your income
Before tax and your own pension deductions. Use one job with regular pay. For salary sacrifice, enter salary after the agreed sacrifice.
Other income Pensions, property, savings and benefits
Annual state and private pension income. Exclude tax-free lump sums.
After allowable expenses and any confirmed TT Homestay allowance. Do not include the same profit under self-employment.
Gross annual interest before tax deducted. Do not apply UK savings allowances.
Annual taxable distributions; not company profit. Use the taxable amount confirmed for any distribution with a tax credit.
Include taxable overseas income in GBP. Establish treaty exemptions and credits separately.
The taxable value from your benefit statement, after exemptions. Include taxable car and fuel benefits; do not enter the purchase price.
Allowances and tax relief Pensions, mortgage interest and eligible expenses

Only claim amounts you qualify for. Check the Government’s eligibility rules ↗

Your annual gross contribution to IOM-approved schemes. Exclude employer contributions and salary sacrifice. Do not deduct it twice from salary.
Ordinary annual maximum £50,000; relevant-earnings limits also apply. Special pension arrangements need advice.
Confirmed deductions only, such as eligible professional subscriptions, tools, protective clothing or employment expenses. Ordinary personal spending does not qualify. Exclude pension contributions, family allowances and the 10% reliefs below.
Eligibility can apply for all or part of the year. Blind registration or qualifying disability-benefit conditions must be met. One allowance per person; both jointly assessed partners can each qualify.
A qualifying child must live with you. Lone-parent relief requires you not to be living with a partner. One claim applies, regardless of the number of children. Check eligibility ↗

Reliefs at 10%

These reduce your tax bill at 10%, subject to limits. They do not reduce the income used for the higher-rate band.

Interest only, not capital repayments. Limit £5,000 per individual assessment or £10,000 jointly.
Eligible claim only; maximum £7,000 per person. Do not include gifts where relief is claimed by the charity instead.
Only payments qualifying under GN14 (including its age and policy conditions). Maximum £1,800 per person.
Nursing care that meets the relief rules, not all care-home charges. Year-specific limits apply.
National Insurance Age, self-employment and special arrangements
Use a confirmed amount for multiple jobs, irregular pay, turning pension age mid-year, under-16 work, overseas coverage, category B/J, or an agreed NI holiday refund.
Advanced adjustments Confirmed taper figures, credits and existing tax-cap elections

Use figures already established by the Income Tax Division or a qualified Manx tax adviser. These fields do not establish entitlement.

Leave blank normally. Required above £100,000 (or £200,000 jointly) when pension or other income deductions are entered. For a joint return, enter the combined figure.
Approved tax credits or double-taxation relief only, not all foreign tax paid. Exclude ITIP already deducted and payments on account. Calculate separate returns individually if applying credits.

Married couples & family allowances

For 2026/27, a jointly assessed married couple or civil partners share a £34,000 personal allowance and a £13,000 band taxed at 10%. For 2025/26 the shared allowance is £29,500; the band is still £13,000. The allowance tapers above £200,000 combined income. Government rates ↗

One income, or two

Joint assessment pools both partners’ income, eligible allowances, deductions and tax bands. If one partner earns less than their allowance, the unused amount can benefit the other. The shared allowance is the couple’s total, not an extra allowance on top of two individual allowances.

Independent assessments

Each person normally keeps their own allowance and £6,500 band. Unused amounts cannot normally be passed between independent returns. Joint payments are usually divided equally unless a different allocation can be shown. Allowance-sharing rules ↗

Marriage, separation or bereavement during the year

In the year of marriage or civil partnership, the normal treatment is independent assessment; joint treatment can begin the following tax year. Special unused-allowance and relief transfers can apply in the marriage year where the conditions are met. Year-of-marriage guidance ↗

Permanent separation and a partner’s death also change the calculation. This tool flags these cases and does not apply a full-year joint allowance automatically. Have the relevant allowances and any transfer confirmed first. Separation guidance ↗

Children, unmarried partners, blindness and disability
  • Lone parents: £6,400 if eligible for the full-year allowance, with a qualifying child. Living with a partner can remove eligibility. Part-year claims use a confirmed reduced amount; having more children does not multiply the allowance.
  • Unmarried couples with a qualifying child: the R136 claim can give one partner an additional allowance based on the other’s unused personal allowance, up to £6,400. Both must meet the whole-year cohabitation conditions and sign the annual claim. It is not joint taxation, and does not transfer the 10% band. Enter the confirmed recipient allowance in individual mode; the donor’s return must reflect the reduction.
  • Blind or disabled: £2,900 for an eligible person, including where qualifying conditions apply for only part of the year. The same person cannot claim both. Two jointly assessed partners can each qualify separately.

Full allowance eligibility ↗ · Official claim forms (R135, R136 and R156) ↗

Which situations does it cover?

Salary, sole trading & mixed income

Salary and bonuses, business profit after allowable costs, partnership profit shares, Class 1 NI and self-employed Classes 2 and 4. NI remains separate for each partner.

Pensions, property & investments

Taxable pensions, rent after eligible deductions, interest, dividends and other taxable income. Add eligible pension contributions and personal reliefs separately.

Households & allowances

Individual, joint or two separate assessments; the high-income allowance taper; eligible lone-parent, blind or disabled allowances. Couples can change assessment to compare their estimates.

Cases needing confirmed figures

Non-resident taxable income, foreign tax credits, tax-cap elections and special NI arrangements have explicit inputs. Part-year residence, losses, company tax, trust income and complex distributions need an individual calculation.

Assumptions and limits
  • Income tax uses the rules for the selected year. Annual employee NI assumes one regular job and annualised weekly thresholds; payslip rounding and uneven pay can change the actual total.
  • State Pension income and reaching State Pension age are different things. Class 4 age exemption applies only if you were over State Pension age at the start of the tax year. Use confirmed NI for a mid-year change.
  • Self-employed Class 2 is charged for the contribution weeks entered. The published full-year totals use 52 weeks in 2026/27 and 53 weeks in 2025/26. Low profit does not create an automatic exception.
  • Mixed employment may lead to an NI adjustment or refund. A deferment result is provisional. NI holidays, category B/J, multiple employments and overseas coverage are not automatically awarded.
  • Pension relief assumes qualifying payments and ordinary relevant earnings. Employer contributions, investment-company directors, unapproved schemes, excess contributions and special pension rules need separate advice. No pension or personal relief reduces Class 4 profit here.
  • Use taxable rental profit after any confirmed TT Homestay allowance (£2,500 in 2026/27, £2,350 in 2025/26, subject to the scheme rules). Benefit-in-kind valuations, capital allowances, loss relief, maintenance agreements and double-taxation relief are not established by this tool. Family-allowance inputs use confirmed claims; marriage-year and bereavement transfers need an individual assessment.
  • No personal allowance credit, child benefit, other benefits, student-loan payments, VAT or corporation tax is calculated. Payments on account and ITIP already paid do not change annual tax liability and are not subtracted here.
  • Ordinary independent assessments do not share unused allowances or reliefs. Specific statutory family claims and marriage-year or bereavement transfers have separate conditions. Joint elections and eligibility for relief must be confirmed independently.

The rules behind the numbers

Checked against Isle of Man Government publications on 11 October 2026. This tool is independent of the Government.