Form 100 $800 Addback

Screen 4, check boxes just before Other Information (Schedule K) - Press F1 and you will get:

Accrue State Tax Option 1

Select the box to perform the following functions with the "calculated" state tax:

* When accruing state taxes using either option, the program automatically carries the sum of overpayments applied from 2019 plus 1^st – 4^th quarter estimated payments to the balance sheet as prepaid state tax (before adjustment by the calculated tax). Alternatively, the unadjusted ending balance of prepaid state tax can be entered directly in the balance sheet. The program functions in the same manner with respect to city, county, and other local taxes.

Note for New York corporations: If you select the box, the program also accrues the New York City and Form 3M/4M taxes.

Note for Oregon corporations: If you select the box, the program also accrues the Multnomah county tax.

Note for Kentucky corporations: If you select the box, the program also accrues the taxes for Kentucky cities being generated.

Note for Ohio corporations: If you select the box, the program also accrues the taxes for Ohio cities being generated.

This may help - Also Form 100 instructions state: 

"

Schedule M-1 – Reconciliation of Income (Loss) per Books With Income (Loss) per Return

Schedule M-1 is used to reconcile the difference between book and tax accounting for an income or expense item. The federal and state Schedule M-1 may be the same when the corporation uses the federal reconciliation method for net income computation. See General Information I, Net Income Computation, for more information. The California Schedule M-1 will be different from the federal Form 1120, Schedule M-1, if using the California computation method for net income. The California computation method is generally used when the corporation has no federal filing requirement, or if the corporation maintains separate records for state purposes."