AI agents for TaxJar
A Monmo AI agent works in TaxJar the way a careful bookkeeper would before each due date. It checks that sales from Shopify and Stripe arrived, prepares state-by-state sales tax figures, watches how close you are to economic nexus in each state and keeps exemption certificates current. It uses your own TaxJar login. Filing and registration decisions stay with you and your accountant.
Updated 2026-11-13 · Free to start. Paid plans from $15 a month.
What agents do in TaxJar
Check imports before a period closes
A few days before month end it compares order totals in Shopify and Stripe with what TaxJar imported, by channel and by day, and lists missing or duplicated orders before any report is built.
AskBefore October closes, compare Shopify and Stripe totals with TaxJar's imported transactions and list any gaps.
Prepare the state report pack
For each state you file in, it pulls gross sales, taxable sales, exempt sales and tax collected for the period, and lays them out in Google Sheets so your accountant can check them line by line.
AskBuild the Q3 sales tax pack for Texas, Washington and New York from TaxJar, one tab per state.
Watch economic nexus thresholds
Every month it adds up sales and transaction counts per state over the window each state measures, compares them with the thresholds your accountant confirmed, and warns you about states getting close.
AskEach month, tell me which states we are within 20 percent of a nexus threshold, based on TaxJar data.
Keep exemption certificates current
It lists customers marked exempt, finds certificates that are missing or about to expire, and drafts an email asking each wholesale buyer for a current one. Marking a customer exempt asks first.
AskFind exempt customers whose certificates expire this quarter and draft a request for a new one.
Explain the rate on an invoice
When a customer questions the tax on an order, it checks the rate for the ship-to address and explains the state, county, city and district parts in plain words, ready for your reply.
AskA customer in Denver says we charged too much tax on order 5521. Check the rate and explain the breakdown.
Keep the filing calendar
It reads your filing frequency and due date for each state, and a week before each one posts a reminder in Slack with the amount collected and whether AutoFile is on for that state.
AskPost a reminder in our finance channel a week before each sales tax due date, with the amount collected per state.
Explain a change in tax collected
If tax collected jumps or drops, it compares this period with the last by state, channel and product tax code, and writes a short note on what changed, such as a new marketplace or a rate update.
AskWhy did tax collected in California fall in September? Compare it with August by channel and product.
How it connects
- 1You connect your own TaxJar account once; depending on your plan, the connection may use the API token from your account settings. The agent sees the transactions, reports and nexus data that account holds.
- 2Only the agents you choose can use TaxJar. Your bookkeeping agent needs it; an ecommerce agent may only need the monthly figures the bookkeeping agent hands over.
- 3Reading transactions and reports and building files happen without asking. Editing a transaction, marking a customer exempt, changing AutoFile or nexus settings and anything submitted to a state ask first. Registering in a new state is your decision.
More in Accounting and payments
Other apps of this kind that agents work in, each with its own page.
Questions people ask
Can an AI agent file sales tax returns in TaxJar?
It prepares the figures and you decide on filing. A Monmo agent checks imports, builds each state's numbers and points out anything unusual. Turning on AutoFile, submitting a return or paying tax is a decision for you and your accountant, and the agent asks before any such step. It does not give tax advice.
Can it tell me where we have economic nexus?
It tracks the numbers and flags states that are getting close, using the thresholds and measuring windows you or your accountant confirm. Whether you must register is a legal question, so the agent prepares the evidence, sales and transaction counts by state and month, and leaves the decision with you.
Does it work with TaxJar data from Shopify and marketplaces?
Yes, for whatever TaxJar has imported. The agent reads transactions by channel, including marketplace orders, and compares the Shopify and Stripe figures with those apps directly, through the TaxJar connection, or in its own browser when the connection does not cover something. Missing or doubled orders come to you as a list.
Is it safe to give an AI agent our sales tax data?
The agent works through the TaxJar account you connect and sees only what that account can. It reads freely, saves its reports in your Library and changes nothing in TaxJar without a card you approve. You can watch its screen, keep TaxJar to one finance agent and remove access at any time.