Matching Wage Deductions to W-2

TT Business recommends making sure that the payroll tax forms match what is recorded as Wages in the tax return (under Deductions). What exactly am I looking at? If I'm looking at the W-2, is it Box 1? If so, that doesn't make sense to me, since our payroll provider subtracts from Box 1 the employee's contributions to their 401k, and I don't see why that wouldn't be a Employer deductible expense. There is a separate section in TT for Retirement Plan, which I assumed was only for Employer Matching/Contribution, not the Employee Contribution. Does Employee Contribution go there?

 

FYI, we're a 2-person S-Corp with both members as significant owners/shareholders and active employees.