Schedule A Medical Expenses Wrksht, line 2e long term care premium will accept an arithmetic negative final value (found this out by typo mistake, then tax due panic, then correction). No error is listed by TT. The "+" details list expansion for a tax form entry can typically accept negative list items but one would hope the list total should always be positive for most tax form line entries, especially Schedule A deductions. In fact, much of the complexity of the US tax forms is to AVOID filers have to deal with negative numbers. Every time you see the "enter the greater/lesser of" or "enter zero if line X is greater/lesser than line Y" constructs it is to avoid locally recording then propagating an arithmetic negative. An expected value add of TT is at least a warning if not an error for final tax form line entries where an arithmetic negative would never make sense. Where the concept of a loss (business, capital, assets, etc.) is a possibility, propagating a negative can make sense. But accepting a negative deduction item?
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TT UI behavior described by dmertz confirmed for H&B edition: deleting previously entered SbyS mode data releases lock on Forms mode data entry. TT UI defect here is not graphically indicating in Forms mode for a field the data entry interlock behavior with SbyS mode - TT Forms mode data entry just seems broken to the user. I use SbyS mode for tax estimation in early Q4 when most data are estimates anyway and details not important, then power-user Forms mode for year-end when all details do matter. One way for TT to indicate interlock in Forms mode within the existing UI concept of operations would be a pseudo-Data Source of "Step-by-step mode entered data" via right-click menu.
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