You could do that but before you do, try to remove the credit from the Business Related Non-Refundable Credits Summary page (Schedule CMS). Go to Forms mode, by clicking on Forms in the upper right corner. Then scroll all the way to the list of forms and find that summary from the Massachusetts forms list. Click on the form, but instead of deleting the entire Form, just delete that credit on the Form. There are 2 schedules you can edit:
- Schedule CMS - the error message is referencing this form (Credit Manager Summary)
- Schedule SC - this is the detail of the septic credit - Review Part 4. It shows previous years' unused credits (a), the amount being used this year (b) (max is $1500 for septic), and the amount you can use in future years (c).
The Septic Credit is available to owners of residential property who repair or replace a failed septic system. No more than $1,500 of the credit may be claimed in a single tax year. The amount of the credit is 40% of the cost with a maximum aggregate credit amount of $6,000.
In computing the credit, any interest subsidy received from the Commonwealth must be subtracted from your expenses. The credit may be first claimed in the tax year in which the repair or replacement work is completed. You must complete Massachusetts Schedule SC and retain it for your records along with a Certificate of Compliance.
If you voluntarily repair or replace a cesspool or septic tank, this credit is not available since it is not considered a "failed" system. @mkm3
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