What happens if I claim the Child Tax Credit for a child who turned 17 during the year?

Your claim will be denied for that child. The CTC requires the child to be under 17 on December 31 of the tax year. A child who turns 17 at any point during 2026 does not qualify — though they may qualify for the $500 Other Dependent Credit instead.

What is the biggest mistake UK parents make with Child Benefit?

The most common mistake is not claiming at all because parents assume they earn too much. The benefit is payable to everyone — the High Income Child Benefit Charge (HICBC) claws it back through tax only if individual income exceeds £60,000. It is always worth claiming and then handling the tax charge separately.

Can I claim Canada Child Benefit if I haven't filed my taxes?

No. Canada Revenue Agency calculates CCB entitlement based on your previous year's tax return. If you have not filed, you will not receive CCB. Filing your taxes — even if you owe nothing — is essential to receive CCB payments.

Does the Australian Family Tax Benefit continue automatically when my child turns 13?

FTB Part A payment rates change at age 13 and again at 16. The benefit does not stop, but the fortnightly amount increases at each threshold. You do not need to report the birthday — Centrelink updates the rate automatically once your child's age is on record.

Common Child Benefit Mistakes Parents Make in 2026

Child benefit systems in the USA, UK, Canada, and Australia each have their own rules — and each has specific pitfalls that cause families to lose money or face unexpected bills. Here are the most frequent mistakes and how to avoid them.

USA: Child Tax Credit Mistakes

Claiming for a Child Who Just Turned 17

The Child Tax Credit applies to children who are under 17 on December 31 of the tax year. Many parents assume "17 or under" qualifies. It does not. A child who turns 17 in January 2026 does not qualify for the CTC for the 2026 tax year. Check ages carefully before filing.

Both you and your qualifying child must have a valid Social Security Number issued before the due date of your return. Children with ITINs (Individual Taxpayer Identification Numbers) do not qualify for the CTC — though they may qualify for the non-refundable $500 Other Dependent Credit.

Ignoring the Phase-Out Calculation

Many families with income just above $200,000 (single) or $400,000 (married) assume they either fully qualify or are completely phased out. The phase-out is gradual — $50 reduction per $1,000 of income above the threshold per child. A family at $410,000 with two children loses $1,000 from their credit, not all of it.

Not Claiming the Additional Child Tax Credit

If your tax liability is lower than your non-refundable credit amount, you can still receive the refundable Additional Child Tax Credit (up to $1,700 per child) if you have at least $2,500 in earned income. Some families think they "owe no taxes so get nothing" and miss the refundable portion.

UK: Child Benefit Mistakes

Not Claiming Because of High Income

The most expensive mistake UK parents make is not claiming Child Benefit at all. The benefit is paid to everyone regardless of income. The High Income Child Benefit Charge (HICBC) applies only if one partner's individual income exceeds £60,000 — and it claws it back through a self-assessment tax charge. Always claim first, then deal with the tax charge separately. Critically, claiming preserves your National Insurance credits.

Missing the First Claim After Birth

Child Benefit is not automatic. You must claim it actively via HMRC — online, by phone, or using form CH2. Delays in claiming mean lost payments: the backdating period is three months maximum. Claim as soon as the birth is registered.

Confusing Individual vs. Household Income for the HICBC

The High Income Child Benefit Charge is based on individual income, not household income. A couple earning £58,000 each (£116,000 combined) is not subject to the charge because neither individual exceeds £60,000. Many couples with high combined incomes unnecessarily opt out of claiming.

Canada: Canada Child Benefit Mistakes

Not Filing Taxes (or Filing Late)

The Canada Child Benefit is calculated from your most recent tax return. CRA cannot process your claim without it. This is the single most common reason families do not receive CCB — or receive a lower amount than they should. File your taxes every year, even with zero income.

Not Reporting Changes in Custody

CCB is paid to the primary caregiver of each child. If custody arrangements change — especially to shared custody — you must notify CRA. In shared custody situations, each parent can receive 50% of the benefit for months the child lives with them. Failing to update means one parent may receive the full amount they are no longer entitled to, resulting in a repayment demand.

Forgetting to Update Marital Status

Marriage, separation, or cohabitation changes affect CCB calculations because benefits are income-tested on net family income. If you separate and do not notify CRA, your benefit may be calculated incorrectly — sometimes resulting in overpayments you will have to repay.

Australia: Family Tax Benefit Mistakes

Not Balancing at Tax Time

FTB Part A and Part B are paid as estimates throughout the year, then balanced against your actual income once you lodge your tax return. If you do not lodge your return by the required deadline, Centrelink will stop your FTB instalments and may require repayment of payments already received. Lodge your tax return promptly every year.

Underestimating Income

FTB is reduced when family income exceeds the income threshold. If you underestimate your income when applying, Centrelink will pay more than you are entitled to throughout the year — and you will owe a debt at tax time. It is better to estimate conservatively and receive a top-up at balancing time than to be hit with a debt.

Not Claiming FTB Part B as a Single Parent

FTB Part B provides additional support for single-parent families (or couples where the secondary earner has low or no income). Single parents with an income under approximately $100,900 qualify for the maximum rate. Many single parents claim only FTB Part A and miss Part B entirely.

How to Avoid All of These

Use an online calculator to estimate your entitlement before contacting tax authorities. This gives you a working figure and helps you ask the right questions. Then verify with the official source — IRS (USA), HMRC (UK), CRA (Canada), or Centrelink (Australia) — before filing or applying.

What Affects Child Benefit Eligibility in 2026 — full eligibility rules by country
Documents Needed for Child Benefit Claims — what to prepare before applying
How to Estimate Family Benefit Payments — worked calculation examples
US Child Benefits 2026 — Complete Guide — all US programmes
UK Child Benefits 2026 — Complete Guide — all UK family support
Child Benefits Calculator — estimate your entitlement instantly

Verified against IRS.gov, GOV.UK/HMRC, Canada.ca/CRA, and Services Australia. Last verified April 2026.

Common Child Benefit Mistakes Parents Make in 2026

Common Child Benefit Mistakes Parents Make in 2026

Frequently Asked Questions