Gusto tax filing is a full-service payroll feature that calculates your payroll taxes each pay period, pulls the money from your business bank account, deposits it with the IRS and state agencies on the correct schedule, and files the quarterly and annual returns that go with it. That covers federal income tax withholding, both halves of Social Security and Medicare, federal and state unemployment, state income tax withholding, most local wage taxes, and year-end W-2s and 1099-NECs. What it does not do is transfer legal responsibility. The IRS still treats you, the employer, as the party who owes the tax and who gets the penalty notice if something is late.
What Gusto Files and Deposits for You
Once you have authorized Gusto as your reporting agent through Form 8655, the platform can sign and submit federal returns, make deposits through the Electronic Federal Tax Payment System, and receive IRS notices tied to those filings.1Internal Revenue Service. About Form 8655, Reporting Agent Authorization Most states require a parallel authorization for state-level filings.
On the federal side, Gusto withholds the employee share of Social Security (6.2% up to the $184,500 wage base in 2026) and Medicare (1.45% with no cap), calculates your matching employer contribution, and withholds the Additional Medicare Tax of 0.9% once an employee’s wages pass $200,000 in a calendar year.2Social Security Administration. Contribution and Benefit Base3Internal Revenue Service. Questions and Answers for the Additional Medicare Tax Federal income tax withholding runs off each employee’s Form W-4.4Internal Revenue Service. Tax Withholding Deposits go out on whichever schedule the IRS has assigned you, monthly or semiweekly, based on your lookback-period liability.5Internal Revenue Service. Depositing and Reporting Employment Taxes
Every quarter, Gusto files Form 941 reporting your wages, federal withholding, and both shares of FICA.6Internal Revenue Service. Third Party Arrangements Once a year, it files Form 940 for federal unemployment, which applies at an effective 0.6% rate on the first $7,000 of each employee’s wages in states that qualify for the full 5.4% credit.7Internal Revenue Service. About Form 940, Employers Annual Federal Unemployment (FUTA) Tax Return If your state has an outstanding federal unemployment loan, your effective FUTA rate rises because of the credit reduction, and Gusto adjusts for that.8Employment and Training Administration. FUTA Credit Reductions
State filings mirror the federal ones. Gusto calculates and remits state income tax withholding and State Unemployment Insurance based on your SUI rate, then files the state-equivalent quarterly wage reports.9Employment and Training Administration. Unemployment Insurance Tax Topic Where a state runs a disability insurance or paid family leave program, Gusto handles those contributions where the platform supports them.
At year end, Gusto generates W-2s for employees and 1099-NECs for contractors, distributes them electronically through each worker’s portal, and files with the SSA and IRS. The statutory deadline is January 31; for tax year 2025 the actual deadline is February 2, 2026, because January 31 falls on a Saturday.10Internal Revenue Service. Publication 509 (2026), Tax Calendars The 1099-NEC reporting threshold rose from $600 to $2,000 for payments made after December 31, 2025.11Internal Revenue Service. 2026 Publication 1099
Where the Automation Has Gaps
Local taxes are the biggest coverage question. Gusto supports many common city and county wage taxes, but not all of them. If you operate somewhere with a local income tax, occupational tax, or transit district tax, confirm during setup that Gusto explicitly covers that jurisdiction. Where it does not, calculating, depositing, and filing that local obligation is on you, and nothing about being a Gusto customer changes that.
Worker classification is a second gap, and a costly one. Gusto issues a 1099-NEC to anyone you set up as a contractor and a W-2 to anyone you set up as an employee. It does not decide which category a worker belongs in. If someone should have been an employee and you paid them as a contractor, federal law calculates your liability for unpaid withholding at 1.5% of the worker’s wages plus 20% of the employee Social Security tax that should have been withheld, doubling to 3% and 40% if you also failed to file the required information returns.12Office of the Law Revision Counsel. 26 USC 3509 – Determination of Employer’s Liability for Certain Employment Taxes
What You Still Have to Do Each Pay Period
Gusto’s automation only runs on the inputs you give it and the money you make available. Three tasks stay yours.
Approve payroll by the cutoff. Each run has a firm approval deadline set by how many business days the bank needs to move funds and how many days remain before the tax deposit is due. Miss it and Gusto cannot pull funds in time to deposit the taxes, and a late deposit generates IRS penalties assessed against you.
Keep the linked account funded. Every payroll triggers two withdrawals, one for net wages and one for tax liabilities. A failed withdrawal halts the tax deposit, and you then have to make the payment manually. Repeated funding failures can also affect the penalty protection Gusto offers.
Keep employee data current. W-4 changes, state withholding certificates, and address updates only affect withholding once you enter them. New hires must be reported to your state’s Directory of New Hires within 20 days of their start date, which Gusto can automate provided you enter the hire promptly.13GovInfo. 42 USC 653a – State Directory of New Hires Getting your SUI rate right at setup matters for the same reason; a wrong rate means wrong state unemployment tax every pay period until it is corrected.
Why the Employer Still Owns the Liability
The IRS position is unambiguous: employers are ultimately responsible for the payment of income tax withheld and both the employer and employee portions of Social Security and Medicare taxes even when using a third-party payroll service, and if the payroll provider defaults, the employer remains responsible for the deposits and the returns.14Internal Revenue Service. Outsourcing Payroll and Third-Party Payers Form 8655 itself carries the same warning: the authorization does not relieve the taxpayer of the responsibility, or of liability for failing, to ensure timely returns and deposits.15Internal Revenue Service. Form 8655, Reporting Agent Authorization
Gusto offers penalty protection when a calculation error or missed deadline is its fault, provided you supplied accurate data and sufficient funds. That protection ends the moment the root cause traces back to you: a wrong EIN, an outdated SUI rate, a late approval, or a bank account that came up short.
The Trust Fund Recovery Penalty
Federal income tax withholding and the employee share of FICA are trust fund taxes because you hold that money in trust for the government. If those amounts go unpaid, the IRS can assess the Trust Fund Recovery Penalty against any individual who was responsible for collecting and paying them and willfully failed to do so, including owners, officers, partners, and anyone with authority over company finances.16Internal Revenue Service. Trust Fund Recovery Penalty The penalty equals the full unpaid trust fund tax plus interest, and paying other business expenses instead of remitting withheld payroll taxes counts as willful behavior. This is personal liability that can survive the business closing.
Penalties When Deposits or Filings Slip
The failure-to-deposit penalty is tiered by how late the money arrives:17Internal Revenue Service. Failure to Deposit Penalty
- 1 to 5 days late: 2% of the unpaid deposit
- 6 to 15 days late: 5%
- More than 15 days late: 10%
- More than 10 days after the first IRS notice, or upon a demand for immediate payment: 15%
The tiers do not stack. A 20-day-late deposit is a flat 10%. Failing to file Form 941 on time adds a separate penalty of 5% of the unpaid tax for each month or partial month the return is late.18Internal Revenue Service. Failure to File Penalty When Gusto is running normally and you have approved payroll on time with money in the account, these penalties should not show up. When they do, the trigger is almost always a missed approval window or an underfunded account.
Year-End Review and Record-Keeping
Before W-2s and 1099s go out, Gusto opens a reconciliation window for you to check total wages, tax withholding, and contractor payments. Use it. Corrections are possible afterward through Form W-2c or a corrected 1099, but the fix is more work than the review.19Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing
Every quarterly 941, annual 940, state wage report, W-2, and 1099 filed on your behalf sits in your Gusto dashboard, and you can download copies whenever you want. The IRS requires employers to keep employment tax records for at least four years after the tax becomes due or is paid, whichever is later.20Internal Revenue Service. Employment Tax Recordkeeping Pull copies periodically to your own storage rather than relying on continued access to the platform. If you ever leave Gusto, or if retention policies change, you will still need those records for an audit.