You should report your total tax liability on Line 24 (amount transferred from Form 1040) and attach a note or statement reporting that this amount was transferred from your Form 1040 Statement.
Sum all of your withholding, estimated payments and credits and report this figure on Line 33 of Form 1040NR. Attach a note or statement listing the sources of the credits for 2021 tax payments that are claimed on Line 33.
Your tax liability (or refund) should be the difference between Line 24 and the credits identified on Line 33.
