How to Check if Hillingdon Calculated Your Council Tax Reduction Correctly
If you've received a Council Tax Reduction decision from Hillingdon and the amount seems lower than it should be, you can verify the calculation yourself before deciding whether to challenge it. The process comes down to three things: checking which income band the council assigned you, confirming they applied the right deductions to your income, and verifying the non-dependant charges. Mistakes happen — especially around Universal Credit element deductions and the disability Band 2 gateway — and the council's decision notice doesn't always make the arithmetic transparent.
You must request a revision in writing within one month of the date on your decision notice using Form 147. Hillingdon aims to complete reviews within 30 days. If you receive a written response and still disagree, you have two months from that response to appeal to the Valuation Tribunal for England (VTE) through the Valuation Tribunal Service (VTS). If the council does not respond within two months, the VTS says you must appeal within four months of first contacting the council.
Step 1: Find Your Decision Notice
Hillingdon sends a written decision notice when they process your CTR claim. It should state:
- The period your award covers
- The income band you've been placed in
- The percentage reduction applied
- Any non-dependant deductions
- Your revised council tax bill
If the notice doesn't clearly show the income figure they used or the band they assigned, you can request a full breakdown by calling 0300 123 1384 or emailing [email protected].
Step 2: Recalculate Your Assessable Income
This is where most errors happen. Hillingdon uses net weekly income after specific deductions to place you in a band. Here's the process:
For earned income:
- Take your net monthly wage (after tax and National Insurance)
- Multiply by 12, divide by 52 to get weekly
- Subtract the £25 earned income disregard
For Universal Credit:
- Start with your total UC award
- Subtract: Housing element, Childcare element, Carer element, Disabled Child element, LCWRA element
- Add back any UC deductions and advance payments
- The remainder is your assessable UC income
- Convert to weekly if the council assessed it monthly
Income that's fully excluded (should not appear in the calculation at all):
- Personal Independence Payment (PIP)
- Disability Living Allowance (DLA)
- Carer's Allowance
- Child Benefit
- Attendance Allowance
If the council included any of these in your assessable income, that's an error.
Step 3: Check Your Income Band
Once you have your net weekly assessable income, compare it to Hillingdon's 2026/27 income band grid:
| Band | CTR % | Single | Couple | Family (1 child) | Family (2+ children) |
|---|---|---|---|---|---|
| Band 2 | 75% | £0–£180 | £0–£250 | £0–£330 | £0–£500 |
| Band 3 | 75% | £0–£90 | £0–£130 | £0–£150 | £0–£260 |
| Band 4 | 55% | £90.01–£120 | £130.01–£170 | £150.01–£210 | £260.01–£340 |
| Band 5 | 35% | £120.01–£150 | £170.01–£210 | £210.01–£270 | £340.01–£420 |
| Band 6 | 15% | £150.01–£180 | £210.01–£250 | £270.01–£330 | £420.01–£500 |
Band 2 is only available if you, your partner, or a resident child receives PIP, DLA, the LCW/LCWRA element of UC, the Disabled Child element, ESA Support Component, or you're registered blind. If you meet the Band 2 gateway and your income is above the Band 3 limit but below the Band 2 limit, check whether the council applied Band 2: both bands give 75%, but Band 2 extends that rate to a higher income.
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Step 4: Verify Non-Dependant Deductions
Hillingdon applies a flat £12 per week deduction for each non-dependant adult in your household. But certain non-dependants are exempt:
- Full-time students
- People receiving State Pension Credit
- People under 18
If the council applied a non-dependant deduction for someone who should be exempt, your award is being reduced incorrectly. Check whether each deducted person actually qualifies as a chargeable non-dependant.
Step 5: Check the Property Band Cap
Hillingdon caps CTR calculations at Band D. If you live in a Band E, F, G, or H property, your award should be calculated as if the property were Band D (£2,045.46/year = £39.34/week in 2026/27). If the council used your actual higher band in the calculation, you're getting the right percentage of a bigger number — but this only matters if the cap wasn't applied when it should have been.
Common Calculation Errors to Look For
UC elements and deductions not handled correctly. The council should disregard Housing, Childcare, Carer, Disabled Child, and LCWRA elements, then add back any UC deductions and advance payments before calculating your income band. If it used the wrong UC income figure, your band assignment may be wrong.
Disability gateway missed. If you, your partner, or a resident child receives PIP, DLA, or a qualifying UC disability element—or you or your partner receives ESA Support Component or is registered blind—and you weren't placed in Band 2, check whether the council was aware of the qualifying status. Sometimes a change in benefit status doesn't flow through automatically.
Wrong household category. A single person with one child should be assessed on the "Family with 1 child" column, not the "Single" column. The thresholds are substantially different.
Earned income disregard not applied. Every working claimant gets a £25/week deduction from earned income before band assessment. If the council's figure matches your gross weekly wage without the disregard, that's £25/week of phantom income inflating your band.
Minimum award applied incorrectly. If your calculated weekly CTR is less than £3.00, Hillingdon grants no award. If the calculation produces £3.00 or more, the minimum-award rule does not reduce it to zero. Check whether a nil award was genuinely below £3 or whether an upstream error pushed it under the threshold.
What to Do if the Calculation Is Wrong
Request a revision. Write to Hillingdon Council within one month of the decision date, referencing your claim number, the specific error you've identified, and the correct figure as you calculate it. You can use Form 147 or send a written request. Hillingdon aims to complete reviews within 30 days and must respond within two calendar months.
Escalate to the Valuation Tribunal. If the written response doesn't resolve it, you can appeal to the VTE through the VTS within two months of receiving the council's response. If the council has not responded within two months, you must appeal within four months of first contacting it. The appeal is free. You'll need your original decision notice, the review outcome, and your own calculation showing the discrepancy.
Keep records. Save copies of everything: the original decision notice, your calculation workings, any correspondence with the council, and the dates you sent them. If you challenge by email, [email protected] provides a paper trail.
The Hillingdon Council Tax Reduction Guide includes a Decision Review Preparation Sheet that walks through each step of verifying the calculation and structuring your challenge. The free checklist covers the basic claim steps.
Frequently Asked Questions
How long do I have to challenge a council tax reduction decision?
You must request a revision in writing within one month of the date on your decision notice using Form 147. If you receive a written response and still disagree, you have two months from that response to appeal to the VTE through the VTS. If the council does not respond within two months, you must appeal within four months of first contacting the council.
Does challenging the decision cost anything?
No. Requesting a revision via Form 147 and appealing to the VTE through the VTS are free. You don't need a solicitor. For welfare-benefits advice or referral to specialist support, contact Hillingdon Advice Partnership on 020 8044 5676.
What if I missed the one-month deadline for a revision?
Hillingdon's Form 147 instructions say a revision request must be made in writing within one month of the decision date. If that month has passed, contact the council promptly to ask whether it will consider your request. If the council has not responded within two months of your first contact, the Valuation Tribunal says you must appeal within four months of that first contact.
Will challenging the decision make my situation worse?
The council reviews the decision and may change it. Check any new written decision carefully; if you still disagree, you can appeal to the Valuation Tribunal Service within the applicable deadline.
Can I get help checking the calculation for free?
Hillingdon Advice Partnership (020 8044 5676) provides free welfare-benefits advice and accepts self-referrals from Hillingdon residents aged 18 or over. Citizens Advice Hillingdon's free Adviceline is 0808 278 7893. Hillingdon links to the entitledto benefits calculator for an estimate you can compare with the council's written calculation.
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