CereTax deployments run in under 90 days. The first month connects your ERP or billing system and sets the nexus baseline, the second maps products and migrates exemption certificates, and the third validates every calculation in a parallel run before your filing partner or accountant takes the first return.
CFOs evaluating sales tax automation ask the same question: how long before this works?
The answer depends on what happens before go-live. Product data has to map to the right tax categories. ERP and billing systems have to send the right transaction fields. You need to know your sales tax nexus footprint and account for every existing exemption certificate. Skip those steps and sales tax automation makes existing errors happen faster.
CFO spending plans for 2026 show why this matters. The Grant Thornton Q1 2026 CFO survey found that 68% of respondents expect IT and digital transformation costs to rise over the next 12 months. In Deloitte's Q4 2025 CFO Signals survey, 50% of CFOs named digital transformation of finance as their top priority for 2026, and 52% listed improving data quality, access, and usability among their top finance transformation priorities.
Sales tax automation is no different.
A tax engine can calculate sales tax automatically, but it needs accurate inputs to produce accurate outputs. A product mapped to the wrong tax category, an outdated exemption certificate, or an incorrect customer location can result in the wrong tax being calculated on every transaction.
The first 90 days build the foundation for accurate, scalable sales tax automation. CereTax connects sales tax calculation, compliance, and reporting to the systems your finance team already uses, so that foundation works from day one.
The first month is the foundation phase, and the work falls into two parallel tracks: technical integration and compliance baseline.
On the technical side, CereTax connects to your existing billing, ERP, or commerce environment. This may include systems such as NetSuite, SAP, Oracle, Microsoft Dynamics, Stripe, or ecommerce platforms handling direct customer transactions.
The API-first architecture sends transaction data into CereTax, returns the calculated sales tax to the source system, and records each calculation with the inputs that produced it.
For standard integrations, the connection goes live in the first month.
At the same time, the compliance baseline establishes where your business currently stands. CereTax can help you review sales by state against current economic nexus thresholds.
The result is a clearer sales tax registration picture: where you are registered correctly, where additional registration may be required, and where prior-period exposure may need to be addressed.
By the end of the first 30 days, your team should have two outputs: a working sales tax integration and a clear view of its current sales tax footprint.
The second phase focuses on product taxability mapping, one of the most important steps in any sales tax automation implementation.
Every product or service in the catalog needs to be assigned the appropriate tax category so CereTax can apply the relevant sales tax rules in each jurisdiction.
For a business selling physical products, this can be simple. For SaaS and other complex businesses, it can involve per-seat plans, usage-based pricing, bundled services, implementation fees, and professional services.
The mapping process can also expose problems in how products are structured and billed. For example, a taxable SaaS product and a potentially exempt professional service may be combined into one line item, creating a different sales tax outcome than if they were separately identified.
Fixing those issues during implementation is far easier than finding them after the wrong tax has gone out on invoices and returns.
This phase also includes exemption certificate migration. Existing certificates can be imported, validated against applicable requirements, and flagged where renewal or additional documentation is needed.
For a CFO, this step builds the record an auditor will ask for: which customers are exempt, on what certificate, and through what date.
Days 61 through 90 are the validation phase.
Before CereTax becomes the system used for live sales tax calculation, its outputs are tested against the existing process for a complete billing cycle. Calculated tax is compared with what the previous method would have produced, and material differences are investigated.
This parallel run is designed to catch three common issues:
| Issue | What Validation Identifies |
|---|---|
| Product mapping | Products assigned to the wrong sales tax category |
| Tax sourcing | Transactions being assigned to an unexpected jurisdiction |
| Exemption gaps | Customers whose exemption status was not migrated correctly |
These issues are much easier to fix before the first return is due than after the wrong tax has been reported.
The final phase also sets up the handoff to your filing partner or accountant. CereTax does not file returns. Your filing partner or accountant prepares and submits them from the calculation records and reports CereTax produces for each period and jurisdiction.
By day 90, live sales tax calculation is validated and your filing partner or accountant has what it needs for the first return.
A CFO does not need to manage the implementation day to day. Two decisions do need executive ownership.
The first is prior-period sales tax exposure. If the nexus review identifies states where an obligation existed before registration, the business may need to decide how to address that exposure.
The second is ambiguous product taxability. Bundled offerings, custom development, professional services, and usage-based products can require a business decision on how to bill and tax them.
CereTax's implementation team provides the tax and regulatory context. The business decides how to handle the ambiguous positions.
The rest of the implementation is a technical and operational process between the CereTax team and your finance or accounting team.
By day 90 your business should run a controlled sales tax operation, with every calculation recorded and every exemption on file.
| Phase | Primary Deliverable | What Your Team Contributes |
|---|---|---|
| Days 1 to 30 | ERP or billing integration and nexus baseline | Sales data and IT access |
| Days 31 to 60 | Product taxability mapping and exemption migration | Product catalog, certificates, classification decisions |
| Days 61 to 90 | Parallel validation and filing-partner handoff | Output review and sign-off on the data your filing partner or accountant receives |
The CFO question at day 90 has three parts: is sales tax calculation now consistent, is compliance easier to manage, and does the business see its tax obligations clearly?
That is the value of a well-executed sales tax automation implementation.
A successful implementation should move sales tax from a recurring manual burden into an automated finance process.
By day 91, your ERP, billing, and commerce systems are connected, products are mapped, exemptions are organized, tax calculations are validated, and your filing partner or accountant is ready to file the first return. Your team also understands how CereTax calculates each transaction and where the business stands on compliance.
See what your first 90 days with CereTax could look like. CereTax connects to your existing billing, ERP, and commerce systems, and deployments run in under 90 days. If you are replacing Avalara, CereTax vs. Avalara covers how the switch runs. The strategy call is where we map your systems, your nexus footprint, and your timeline.
Book a Strategy Call with CereTax to map your sales tax environment, your systems, and your implementation timeline.
