A few things to note:
If you filed an extension, your tax return is due October 15th. Even though there are not penalties or interest when you receive a refund, that doesn't necessarily mean there are no negative consequences to filing a late tax return. For example, filing late could eliminate the ability to make certain elections.
Even after you make four payments to your loan, it could take some additional time for the offset removal to be processed by the Department of Education, then by the IRS. In some cases, it could take many months.
If you file the tax return and they do offset the refund, it will reduce the amount of debt that you have, which can be a good thing.
