ITR filing: Switching between old, new tax regimes possible, with some hassles

Also read: Moneycontrol's income tax return-filing guide 

The lower rates come at the cost of giving up deductions and benefits that help you reduce tax. There are 70 types of expenses and investments that are disallowed as deductions and exemptions if you select the new tax regime, which offers a lower tax rate in return for simplicity of compliance.

If you realise at the tax-filing stage that the old regime is more tax-friendly, you can still claim the deductions provided you incurred expenses on rent, loan instalments, health insurance, medical treatment of disabled people or fighting select diseases. Even investments in provident funds, tax-saving fixed deposits or tax-saving mutual funds can help you claim exemptions.

“Before filing tax returns, we check the tax outgo for each individual under both regimes. If an individual is able to save tax, then there is no harm in changing the tax regime,” said Sudhir Kaushik, co-founder of TaxSpanner.com.

Also read: New vs old tax regimes: There is still time to weigh and choose the I-T regime that suits you

Easier said than done

Yet, switching the tax regime at the time of filing returns is a cumbersome task.

This is because one needs to inform the employer at the start of the financial year about the tax regime you will follow. The employer then deducts taxes accordingly – a lower percentage for the new regime with hardly any tax-saving investments. This translates into a shorter Form 16 as details of tax-saving investments and deductions are not needed.

If you try to switch to the new regime at the return-filing stage, the Form 16 break-up will not be accurate and could create a major calculation complication.

“Detailed break-up of Form 16 is needed for the income tax return forms. If the numbers in Form 16 do not match the details of salary and tax deductions mentioned in the return, there would be a mismatch in the AIS (annual information statement) records too,” said Ameet Patel, a partner at Manohar Chowdhry & Associates.

Not all deductions offered under the old tax regime can be claimed.

“You cannot claim LTA (leave travel allowance) as the employer needs the details,” said Patel.

What if you still claim?

Technically, nothing prevents individuals from selecting the tax regime at the return-filing stage.

“The Central Processing Centre (CPC) would reconcile the salary details mentioned in the AIS. So, unless details with all four sources – the CPC, Form 16, Form 26 AS and Annual Information Statement – match, processing the returns would be tedious,” said Patel.

If there is a mismatch, you may receive an “intimation notice” or Form 143 (1).

Also, remember to mention your bank account in your income-tax return.

“One would also need to be careful while mentioning bank details as the refunds would be credited to these accounts if you save taxes after changing the tax regime,” said Paras Savla, a partner at KPB & Associates.

Watch out for penalty and interest

If you change your tax regime to come clean on some income you had missed and end up increasing the tax amount, you could face penal interest.

This is because a lower payment of advance tax (paid on June 15, September 15, December 15 and March 15 of the last financial year) would lead to interest accumulating from the quarter when the advance tax was not paid.