There’s one sales tax scenario every finance and accounting team dreads: a state notice arrives, and you realize that your sales tax platform has been calculating tax incorrectly for months. Your platform no longer suits your needs. Or worse, it never did in the first place.
Switching to a better platform mid-year may feel risky. But the longer you delay, the more exposure compounds and manual workarounds pile up.
The transition doesn’t have to be a scramble, however. Done deliberately, implementing a new tax platform can be a necessary part of growth. The risk lies in switching without a plan, which could disrupt your processes at key moments and cause you to miss the biggest tax dates of the year.
In this article, we’ll break down the reasons that turn switching sales tax platforms from a maybe into a must, and share best practices and timelines you can follow to ensure a smooth transition and make your first post-transition filing uneventful.
Key takeaways
- Switching sales tax platforms is a project managed around tax dates, not a software install.
- Three dates control the transition: go-live, tax collection, and tax calculation.
- Registrations, historical data, and a parallel testing window are where most transitions succeed or fail.
How do you know if it’s time to switch tax platforms?
The decision to switch sales tax platforms shouldn’t be taken lightly. But when certain challenges arise, it may be the best option. When these challenges arise, it’s time to start considering a new solution.
Your billing model outgrew the engine
Growing software companies often expand or adapt their billing model over time. An enterprise SaaS company might introduce a self-serve motion, while a dev tools platform may transition from subscription pricing to usage based. Not all sales tax automation platforms are built to support every business model.
If your billing model has changed and your current tax platform doesn’t support new needs, it will likely struggle to handle current requirements like prorations and usage-based invoices.
Taxability gaps on software
Software taxation varies broadly from state to state and city to city. For example, while Texas treats SaaS as a data processing service, which is taxable in the state, California treats SaaS as untaxable as it isn’t tangible, isn’t downloaded, and involves no transfer of a title. Scaling businesses can go from selling in a handful of states to dozens practically overnight. If your sales tax platform was never built to handle the nuances of software taxation across jurisdictions, you’ll struggle to manage sales tax as your organization continues to grow.
Manual filing burden
Calculating sales tax is necessary for modern tax platforms, but it’s certainly not a sufficient service alone for growing organizations. If your platform calculates but leaves your team to prepare and file returns manually, your processes will be unsustainable as you scale.
International expansion
International expansion exposes your organization to a variety of new sales tax complexities. Non-EU businesses selling digital services into the EU, for example, are subject to VAT from the first transaction, without any exposure threshold. Many sales tax automation platforms were only built to support domestic sales tax, and require partner vendors or bolt-on modules for international VAT and GST obligations.
But these workarounds carry implementation costs and can create operational and audit complexities in the long run. Scaling organizations are best partnering with a sales tax automation platform built to support both domestic and global tax obligations in a single platform.
When the time is right to switch sales tax platforms, it’s essential to know exactly what’s involved in the switching process so that you can define appropriate timelines and resources.
What does switching tax platforms involve?
Switching sales tax platforms doesn’t just mean swapping a calculation API. It requires a fundamental change to your tax engine processes and greater infrastructure.
Here are some of the core processes to include in your transition plan:
- Importing historical transaction data into your new sales tax platform so that is can monitor exposure and nexus correctly
- Mapping each SKU, plan, and line item to the correct tax category in the new platform
- Adapting to new tax determination logic, including calculation for prorations, credit memos, refunds, true-ups, and mid-cycle changes.
- Re-establishing state portal logins, third-party access or power of attorney grants, and filing frequency per jurisdiction for registrations
- Migrating exemption certificates and their expiry dates to the new platform so that exempt customers don’t get taxed in their next invoice
- Defining reconciliation and reporting workflows.
- Establishing where physical state correspondence can be sent, and who can open it.
- Reconnecting integrations to platforms such as Billing, ERP, CRM, eCommerce and Checkout, Payment, and HRIS
While the transition may seem daunting, it doesn’t have to be. Companies with subscription or usage-based billing models, like SaaS, can transition different sales tax workflows on different timelines if they plan around key tax dates correctly.
The three dates that make or break your transition
By strategically timing your transition to a new sales tax automation platform around your tax collection data and your tax calculation date, you can get your new platform up and running while making sure your first post-transition filing is uneventful. Here are the three dates to plan around.
Your go-live date
This is the date you turn off the previous provider and switch on the new one. It’s ideal to plan your transition date for the first day of a month. This allows the old platform to own a complete closed period.
Your tax collection date
This is the date your new platform starts applying tax to invoices. It’s usually identical to your go-live date. Set your collection date jurisdiction by jurisdiction, as not all registrations clear at the same time, and adjust jurisdictions in the dashboards as registrations come through.
Your tax calculation date
Also understood as the return filing date, this governs when the new platform starts calculating liability in a jurisdiction, which is distinct from putting tax on an invoice. If you file quarterly rather than monthly, this date usually needs to move backward. A February 1 go-live in a quarterly jurisdiction means a January 1 calculation date, so the full quarter's return can be filed from one system.
Plan these three dates in sequence, starting with your filing calendar rather than your go-live date. Map how often you file in each jurisdiction, then choose a go-live date that lands on as many period boundaries as possible. January 1st, for example, aligns monthly, quarterly, and annual periods at once, while a May 1 go-live leaves every quarterly jurisdiction with a split return to reconcile.
From there, you can work backward to set calculation dates at the start of each filing period and forward to set collection dates in any jurisdiction where registration is still pending.
Best practices for switching tax platforms
Once you’ve established a transition timeline that aligns with your filing calendar, there are several best practices you can follow to ensure you hit your go-live target successfully.
- Start with a data and obligations audit
Catalogue where you’re registered, filing frequency per jurisdiction, open notices, and exemption certificates on file. - Plan the registration handoff
Transferring filing responsibility often takes longer than integration work and is the most common source of delay. The transfer includes sharing portal credentials, filing authorizations, and notice routing in alignment with each state’s timeline. - Preserve your historical data
Ensure you have access to past transactions so that they can be uploaded to the new platform for amendments and audit defense in future. - Brief your key stakeholders
RevOps, Billing, Support, and external accountants will all be impacted by the transition. Ensure they’re aware of the process and any ways it might alter their workflows. - Don’t forget to file your final return on the old platform!
Your old platform may still owe returns for periods it calculated, and those filings can fall due after go-live on the new platform. Confirm who owns each return, and ensure your old contract is active until all its returns have been filed. Instruct your old provider not to file split-period returns, as these may be handled by your new platform.
Making the switch with Anrok
Switching tax platforms can be a complex process, but luckily you don’t have to navigate it alone. Leading sales tax automation platforms like Anrok provide onboarding support to ensure migrating customers complete the transition without missing any deadlines.
- Test before you commit: Connect your billing system in ingest-only mode while your existing provider is still calculating tax, so you can monitor nexus and exposure against real transactions before anything is switched on.
- Split-period returns are a defined process: If both engines contributed to a filing period, you can instruct your previous provider not to file and Anrok files the complete return instead, backfilling transactions and calculating from the start of the period.
- Registrations and filings transfer to Anrok's tax team: After transitioning to Anrok, submitting registrations, and providing access to state filing accounts, Anrok’s tax team begins managing your existing US sales tax registrations and filing US returns on your behalf
If you’re considering switching tax platforms, connect with one of Anrok’s tax experts to learn more about the migration process and whether Anrok could be a good fit for you.
