June 25, 2026

You can now override Check's calculated federal and state income tax withholding on individual payroll items using a new “tax_overrides” field on Payroll Item API! This feature is available in Sandbox today, and will be made available in Production next Thursday, July 2nd.

Tax overrides allow you to build support into your payroll product for cases where employers and employees want a specific withholding tax amount withheld, instead of the amount that would normally be calculated based on the employee’s W-4 elections. For example, an employer could use this to reduce or zero out withholding on an off-cycle bonus or if their employee is following a specific tax withholding strategy defined by their CPA.

For more details about tax overrides and how to integrate, refer to our API guide and Payroll Item API documentation.

We are introducing a limit to how many times the same blocker can be removed from a company filing. Starting July 1st, you will be able to remove a given blocker on a company filing up to 2 times via API or Console. A third attempt to remove that same blocker will be rejected with a too_many_blocker_removal_attempts error.

Removing a blocker signals to Check that the underlying issue has been addressed, clearing the filing to proceed. When the same blocker keeps reappearing, it means the root cause hasn't actually been resolved with the tax agency, so removing it again only lets the filing fail and re-block without explanation for the customer. This new cap stops that unproductive loop and points you and the customer to create a ticket, where support can be provided.

If you reach the limit, please ensure the issue has been resolved directly with the agency, then contact Check support to have the blocker removed.

We've created a Balancing Payrolls & Fulfillment Receipts Guide to provide a visual example of how to best surface quarter end tax reconciliation to employers and detail how to configure the backend. The guide walks through actions like subscribing to fulfillment.created webhooks, surfacing balancing fulfillments in a clear employer-facing flow (banner → detail page → receipt PDF), and communicating the timeline before funds move.

You can now read Check's tax catalog directly from the API. Two read endpoints surface the taxes and agencies Check works with. Both use a canonical lowercase jurisdiction code (fed, ny, pa) so you can filter by region.

This makes migrations easier: resolve a prior system's tax codes to Check taxes and keep them current as the catalog changes. You can also filter by supported to see which taxes Check calculates.

This is the first of a consistent set of tax, agency, and jurisdiction references we'll use across the API, so you can increasingly group and reconcile tax activity the same way everywhere.

This is available now in Sandbox and Live environments. See the Tax and Agency API references for full details.

Check can now remit P&I directly to select agencies on a company’s behalf as part of notice resolution. Supported agencies currently include IRS, California EDD, Colorado DLE, Kentucky DOR, Indiana DOR, Denver OPT, and Oregon (SIT, SUI, WBF + Transit Taxes). We plan to expand coverage over time.⁠⁠

See full details in the Help Center.

Tomorrow, Friday June 26th, we will be enabling a new setup parameter for Washington employers called “Washington State Labor & Industries Supported Risk Class Codes”.

All employers with a Washington Labor and Industries (L&I) account are assigned a list of risk class codes by the agency. This new parameter collects that list of risk class codes, and is used to ensure that employees and earning codes are not set up with risk class codes that are not part of this assigned list. This is intended as a safeguard against failed Washington L&I filings, which can occur if an employee has hours under risk class code that is not part of the employer’s assigned list.

This parameter will be automatically updated at the end of every quarter by a rate exchange process for employers for whom Check has third party administrator access for Washington L&I. We will be releasing this setup parameter alongside performing the rate exchange for Q2 2026, so most employers will have settings pre-populated. Other Washington employers will see their onboard status move to a “needs attention” status.

We’ve released several major performance enhancements to our API Logs and Activity Logs in Console. Loading these pages should feel snappy, and filtered searches that previously took many seconds to load should now load much more quickly. We’re going to be making more enhancements here soon, bringing API Logs into our public API and exposing them through our MCP in the coming months. Stay tuned!

Our Q3 Webinar schedule is out and open for sign ups! We’re hosting webinars on tax notices, our benefits ecosystem, tax receipts, MCP server, and more. Register here and share the link with your team.