{"id":961,"date":"2025-07-30T07:50:56","date_gmt":"2025-07-30T07:50:56","guid":{"rendered":"https:\/\/www.luzenta.com\/blog\/?p=961"},"modified":"2025-07-30T07:50:56","modified_gmt":"2025-07-30T07:50:56","slug":"still-time-to-file-your-tax-return-why-delaying-can-cost-you-more-than-a-penalty","status":"publish","type":"post","link":"https:\/\/www.luzenta.com\/blog\/still-time-to-file-your-tax-return-why-delaying-can-cost-you-more-than-a-penalty\/","title":{"rendered":"Still Time to File Your Tax Return? Why Delaying Can Cost You More Than a Penalty"},"content":{"rendered":"

In early 2021, HMRC made an announcement that aimed to ease pressure on taxpayers amid the ongoing disruption caused by the pandemic. The government confirmed that individuals who filed their 2019\/20 Self Assessment tax returns after the 31st January 2021 deadline but before 28th February 2021 would not face a late-filing penalty. This one-month grace period provided some breathing room for those who were struggling to meet the original date. However, many misinterpreted this as an extension to the full Self Assessment deadline, including both filing and payment.<\/span><\/p>\n

The reality is that while the late-filing penalty was temporarily postponed, the payment deadline remained firm. Tax liabilities for the 2019\/20 tax year were still due by 31st January 2021. That means from 1st February onwards, interest began accruing on unpaid amounts, regardless of whether a taxpayer had filed their return within the additional month.<\/span><\/p>\n

This divergence between the payment and filing rules has created considerable confusion. Filing by the end of February avoids the automatic \u00a3100 penalty, but it does not eliminate the financial implications of missing the payment date.<\/span><\/p>\n

Why Interest Still Applies<\/b><\/p>\n

One of the main reasons it’s critical to file your return as soon as possible\u2014even with the February concession\u2014is to prevent interest from building up on unpaid tax. HMRC charges interest at an annual rate of 2.6% on overdue tax, which began accruing from 1st February 2021. This interest continues until the outstanding balance is paid in full.<\/span><\/p>\n

Importantly, even though you’re avoiding a filing penalty within the grace period, you’re still being financially penalised through interest charges. Every day that passes increases the amount you owe, so delaying your return and payment only makes the situation more costly.<\/span><\/p>\n

Impact on HMRC Enquiry Timeframes<\/b><\/p>\n

Another less-known consequence of filing after the 31st January deadline is that it can affect the period during which HMRC is allowed to open an enquiry into your tax return. Normally, HMRC has 12 months from the date you file to raise an enquiry.\u00a0<\/span><\/p>\n

However, if your return is late, the timeframe for review can be extended. This potentially puts you at a higher risk of investigation, even if your return is submitted by 28th February. Filing on time isn’t just about avoiding penalties; it can also provide a more predictable and limited window for HMRC scrutiny.<\/span><\/p>\n

Importance for Claimants of Tax Credits<\/b><\/p>\n

Individuals who claim tax credits and provided estimated income figures before the 31st July 2020 renewal deadline were still required to confirm their actual income by 31st January 2021. If you fall into this category and missed that date, you could be putting your claim at risk. Although HMRC has said it will usually update the information once you file, there’s no guarantee that your entitlements will remain unchanged.<\/span><\/p>\n

Failing to confirm your income could result in overpayments, which HMRC may later demand to be repaid, or in a reduction in your current support. To protect your entitlement and avoid future complications, it is essential to file as soon as possible.<\/span><\/p>\n

Class 2 National Insurance Contributions and Benefit Eligibility<\/b><\/p>\n

For self-employed individuals, paying Class 2 National Insurance contributions is essential not just for tax compliance but also for accessing state benefits. These contributions are included in your Self Assessment bill and must be paid by 31st January. If your return is filed late, you risk not making the payment in time, which could affect your eligibility for benefits such as Maternity Allowance or the State Pension.<\/span><\/p>\n

Some benefits are calculated based on whether your contributions were made by the deadline. Therefore, even if HMRC doesn’t penalise you for late filing before 28th February, the delay could impact your ability to claim or continue receiving certain types of support.<\/span><\/p>\n

Why You Shouldn\u2019t Wait Until the Final Hour<\/b><\/p>\n

Given all these factors, the best course of action is to file and pay your Self Assessment tax return as early as possible. Waiting until the last few days of February might help you avoid a filing penalty, but you\u2019ll still be accruing interest every single day. Moreover, technical issues, last-minute complications, or miscalculations can cause further delays and increase your risk of falling into more serious non-compliance.<\/span><\/p>\n

Filing sooner rather than later allows you to:<\/span><\/p>\n