Softwr

Accounting · head to head

Modern Treasury vs TaxJar

Modern Treasury logo

Modern Treasury

Accounting

Payment operations and ledger infrastructure that sits between your product and your own bank accounts

From
On request
Rated
-
Full reviewWebsite
TaxJar logo

TaxJar

Accounting

Sales tax, simplified

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only TaxJar has a free tier, so it costs nothing to try first.
  • Each has a real cost: Modern Treasury you must already have or be able to obtain your own bank accounts with the right connectivity, so early stage companies without a banking relationship cannot use it and are pushed towards a sponsor bank model instead.; TaxJar both published plans include only 200 orders per month, so higher volume costs more
  • They diverge on capability: Modern Treasury covers Multi-rail payment initiation, TaxJar covers Tax calculation.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Modern Treasury and TaxJar actually diverge.

Attributes where Modern Treasury and TaxJar differ
AttributeModern TreasuryTaxJar
Starting priceOn requestFree
Pricing modelquoteusage-based
Free tierNoYes
PlatformsWebWeb, Api
FoundedUnknown2013

Identical on both: user rating (Not yet rated), category (Accounting).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Modern Treasury

  • Multi-rail payment initiation
  • Bank connectivity
  • Ledgers
  • Automatic reconciliation
  • Approval workflows
  • Virtual accounts
  • Compliance tooling
  • Return and exception handling

Only in TaxJar

  • Tax calculation
  • AutoFile returns
  • Economic nexus tracking
  • Exemption certificates
  • Multi-channel support
  • Shopify
  • Amazon
  • WooCommerce

What people use each for

The jobs each tool is most often brought in to do.

Modern Treasury

  • A marketplace paying out to thousands of sellers that needs a ledger its application can trust rather than reconciling a payments dashboard by handnot TaxJar
  • A lender originating and servicing loans that must track disbursements, repayments and returns against its own bank accountsnot TaxJar
  • A company that wants to move off a banking as a service provider and hold its own bank accounts after seeing sponsor banks offboard fintech programmesnot TaxJar
  • An insurer handling premium collection and claims payment across several rails with approval controls and an auditable trailnot TaxJar

TaxJar

  • Calculating US sales tax at checkoutnot Modern Treasury
  • Reporting sales tax liability by state and jurisdictionnot Modern Treasury
  • Automatically filing state sales tax returnsnot Modern Treasury

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Modern Treasury

  • You must already have or be able to obtain your own bank accounts with the right connectivity, so early stage companies without a banking relationship cannot use it and are pushed towards a sponsor bank model instead.
  • Pricing rests on an annual minimum commitment, and companies that miss their volume forecast pay the minimum regardless, which makes the headline per-transaction rate close to irrelevant in year one.
  • Supported bank connectivity is a finite list, so if your bank is not on it you are either waiting for an integration or changing banks, which is a far larger project than adopting the software.
  • It is software over banking, not banking, so it does not solve card issuing, deposit accounts or the licensing questions that a company embedding financial products still has to answer elsewhere.
  • The ledger is genuinely good but adopting it properly means making it the source of truth for balances in your product, which is a significant application change rather than a payments integration and is where implementations run long.

TaxJar

  • Both published plans include only 200 orders per month, so higher volume costs more
  • The Starter plan at $39 per month allows only 3 data import integrations
  • AutoFile state filings are metered: Starter includes 2 credits a year and each extra filing costs $50, Professional includes 4 and each extra costs $55
  • Real time tax calculation API access requires the Professional plan at $99 per month
  • Phone support, a Customer Success Manager and a dedicated onboarding specialist require the Professional plan
  • The developer sandbox requires the Professional plan
  • The 10% saving requires annual billing

Pricing, plan by plan

Modern Treasury

On request
  • Modern Treasury Platform$undefined/year
    • Platform access fee covering API, dashboard, infrastructure and support
    • Usage-based fees across ACH, wires, RTP, FedNow, push to card, cheques and stablecoins
    • A single annual minimum commitment that both platform and usage fees count towards

TaxJar

Free
  • Starter$39/month
    • Up to 200 orders per month
    • 3 data integrations
    • API access included
  • Professional$99/month
    • Up to 200 orders per month
    • 10 total data integrations
    • 10,000 API calls per minute

Which should you pick?

Choose Modern Treasury if

  • You need multi-rail payment initiation.
  • You also want bank connectivity.
Modern Treasury review

Choose TaxJar if

  • You need tax calculation.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want autofile returns.
TaxJar review

Questions people ask

Is Modern Treasury or TaxJar better?
Neither clearly leads. Modern Treasury starts at On request and TaxJar at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Modern Treasury or TaxJar?
TaxJar has a free tier; the other does not. Paid plans start at On request for Modern Treasury and Free for TaxJar.
Does Modern Treasury or TaxJar run on more platforms?
Modern Treasury runs on Web. TaxJar runs on Web, Api.
Can I use TaxJar for free?
Yes. TaxJar has a free tier, so you can try it without paying. Modern Treasury starts at On request.
What is Modern Treasury best used for?
Modern Treasury is most often used for a marketplace paying out to thousands of sellers that needs a ledger its application can trust rather than reconciling a payments dashboard by hand, a lender originating and servicing loans that must track disbursements, repayments and returns against its own bank accounts, a company that wants to move off a banking as a service provider and hold its own bank accounts after seeing sponsor banks offboard fintech programmes, an insurer handling premium collection and claims payment across several rails with approval controls and an auditable trail. Of those, a marketplace paying out to thousands of sellers that needs a ledger its application can trust rather than reconciling a payments dashboard by hand and a lender originating and servicing loans that must track disbursements, repayments and returns against its own bank accounts are not what TaxJar is typically brought in for.
What can Modern Treasury do that TaxJar cannot?
Modern Treasury covers Multi-rail payment initiation, Bank connectivity, Ledgers, Automatic reconciliation. TaxJar covers Tax calculation, AutoFile returns, Economic nexus tracking, Exemption certificates.

Answered from the vendors’ own pages

Modern Treasury: Is Modern Treasury a bank or a banking as a service provider?

Neither. You hold your own bank accounts and it is software over them. That avoids sponsor bank concentration risk but means you need the bank relationship yourself.

TaxJar: How much does TaxJar cost?

TaxJar pricing starts at $39/month for Starter and $99/month for Professional. Save 10% or more with annual pricing. A 30-day free trial is available.

Source
Modern Treasury: What does it cost?

Not published. A platform access fee plus usage fees across rails, on an annual term with a single minimum commitment. Negotiate the minimum, not the per-transaction rate.

TaxJar: What is the difference between TaxJar Starter and Professional?

Both plans handle up to 200 orders/month, but Professional includes phone support, dedicated success manager, 10 users, and more data integrations and API capacity.

Source
Modern Treasury: Which rails are supported?

ACH, wires, RTP, FedNow, push to card, cheques and stablecoin payments, subject to what your bank supports.

TaxJar: Does TaxJar offer discounts for annual billing?

Yes, TaxJar saves customers 10% or more when paying annually instead of monthly for both Starter and Professional plans.

Source
Modern Treasury: Do we still need our own compliance programme?

Yes. KYB, KYC and transaction monitoring are included in the platform, but you are the one holding the accounts and the regulatory obligation sits with you and your bank.

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