Yes sorry. SALT is State And Local Tax. Which includes property tax, any state tax paid like for last year’s return and includes any state withholding from your W2s and any 1099s you have. You can only deduct up to 10,000 (5,000 MFS) for SALT State and Local Taxes.
So the amount over 10,000 shows up as a negative number. It doesn’t mean anything and doesn’t go anywhere. Just for your info to let you know how much you can’t deduct this year.
This year the Standard Deduction will be doubling so many people will be switching to the Standard Deduction.
FAQ on 2018 changes
https://ttlc.intuit.com/questions/4482394-how-will-tax-reform-affect-my-2018-federal-tax-return For 2018 the standard deduction amounts are:
Single 12,000 + 1,600 for 65 and over or blind
HOH 18,000 + 1,600 for 65 and over or blind
Joint 24,000+ 1,300 for each 65 and over or blind
Married filing Separate 12,000 + 1,300 for 65 and over or blind