10 Common Tax Filing Mistakes in Nepal — And How to Avoid Them

Most tax problems in Nepal don't start with dishonesty — they start with small, avoidable slip-ups made under deadline pressure. A missed date, an unclaimed deduction, a mismatched TDS figure. Individually, each one seems minor. Together, they're responsible for the majority of penalty notices, delayed refunds, and stressful IRD follow-ups that taxpayers deal with every year. Here are the ten mistakes that come up again and again, and simple ways to avoid each one.

1. Missing the Ashwin-End Deadline

Nepal's individual income tax return deadline typically falls at the end of Ashwin (mid-October), three months after the fiscal year closes at the end of Ashad. Treating this as a "sometime in autumn" date instead of a fixed one is the single most common cause of late-filing penalties and accruing interest. Mark the exact date each year rather than relying on memory of "roughly when it was last year," since IRD circulars occasionally adjust deadlines.

2. Forgetting to Claim SSF/EPF/Insurance Deductions

Contributions to the Social Security Fund (SSF), Employees Provident Fund (EPF), and eligible life or health insurance premiums all qualify for specific deductions against taxable income, up to prescribed limits. Taxpayers who prepare their own returns often forget to gather these certificates in time, effectively paying more tax than legally necessary. Keep a running folder of these documents throughout the year rather than searching for them in Ashwin.

3. Filing Under the Wrong PAN Category (Individual vs. Business)

A PAN registered for business purposes and a PAN used for purely personal income follow different filing forms, schedules, and obligations. Freelancers and small business owners sometimes file personal-style returns against a business PAN, or vice versa, creating mismatches that draw IRD queries. Confirm which category your PAN is actually registered under before choosing a filing pathway, especially if your income situation has changed since registration.

4. Not Reconciling TDS Certificates with Actual Filing

Employers, banks, and clients issue TDS certificates showing tax already withheld on your behalf throughout the year. A surprisingly common mistake is filing a return that doesn't match these certificates — either omitting a source of withheld tax entirely or entering a different figure than what was actually deducted. Cross-check every certificate against your return line by line before submission, not after receiving a discrepancy notice.

5. Losing Supporting Documents Before the 7-Year Window Closes

Tax records in Nepal generally need to be retrievable for several years after filing, since IRD can review and query past returns within that window. Receipts, TDS certificates, and supporting statements that get discarded during a house move or old-phone upgrade become a real problem if a past return is ever questioned. Scan and back up key documents digitally as you receive them, rather than relying on physical copies surviving years of storage.

6. Ignoring Married-Status Slab Benefits

Nepal's income tax slabs offer a wider tax-free and lower-rate threshold for couples filing under married status compared to an individual, in recognition of shared household expenses. Some married taxpayers continue filing under individual slabs out of habit or unfamiliarity with the couple option, missing out on a legitimate reduction in overall tax liability. Review which slab structure genuinely applies to your household each year rather than defaulting to whatever was used previously.

7. Not Reporting All Income Sources

A salaried return that leaves out rental income from a side property, freelance consulting fees, or investment gains isn't just incomplete — it's a compliance risk. Many taxpayers assume that if tax was withheld somewhere, they don't need to mention that income at all, but non-final withholding amounts and additional income streams often still need to appear on the return, even if partially taxed already. List every income source at the start of filing, then work through which ones need further reporting.

8. Incorrect Bank/RTGS Details Delaying Refunds

When a return results in a refund, an outdated or mistyped bank account number can hold up that money for months while it gets traced and corrected. This is a small, purely administrative error that causes disproportionate frustration. Double-check bank details on the return against a recent passbook or statement every single year, even if nothing else about your account has changed.

9. Missing Advance Tax Installments

Taxpayers with significant non-withheld income (business owners, larger investors) are often required to pay advance tax in installments throughout the fiscal year, rather than as one lump sum at filing time. Missing these scheduled installments accrues interest, even if the full amount is eventually settled correctly at year-end. If you're liable for advance tax, calendar each installment date separately from the main annual deadline.

10. Not Updating PAN Details After Address/Business Changes

Moving house, changing a business address, or shifting the nature of your work without updating your PAN record creates a mismatch between what IRD has on file and your actual current situation. This can complicate notice delivery, verification, and future transactions requiring PAN confirmation. Treat a PAN update as a standard part of any major address or business change, the same way you'd update it with a bank or utility provider.

Most of these mistakes share a common thread: they're avoidable with a bit of early preparation rather than a last-minute scramble before the Ashwin deadline. If you haven't already, it's worth pairing this list with a proper deduction checklist and a clear deadline calendar for your specific filing category, so nothing on this list catches you off guard next year.