that depends on whether you have other sources of QBI. net SSTB income is subject to a phase out if your taxable income is too high
here's an oversimplified example
$200K as taxable income single filing status
$100K of SSTB income
$50K of non SSTB loss
Because of the SSTB income phaseout due to taxable income being over the limit the QBI for the SSTB is only $40K
while the full $50K loss from non SSTB is QBI. they net to a $10K loss so no QBI deduction in the current year and the $10K QBI loss carries over to the next taxable year.
had taxable income been only $100K there would be a $10K QBI deduction
switch it to $100K sstb loss and 50K of non SSTB income with taxable income 200K and you have a QBI loss carryover of $50K
answer the QBI questions as to SSTB correctly. the examples assume all income and losses are non passive because passive losses nay never make it to the QBI computation
if you want to do your own calcs get form 8995/8995A from the iRS website. that's the forms for computing the qbi
https://www.irs.gov/site-index-search?search=8995&field_pup_historical_1=1&field_pup_historical=1
