DissoMaster is dead. Here's what to use instead — and what's actually 'certified.'

If you came to California family-court guideline calculations in the last twenty years, you came in through DissoMaster. It was the bench tool. Judicial officers used it. Family-law attorneys built fee structures around it. Mediators printed its worksheets and stapled them to settlement memoranda. For two decades it was, functionally, the California child-support calculator.

In 2025, the publisher discontinued it.

Around the same time, the California Department of Child Support Services pulled its own free public guideline calculator offline pending federal tax-law updates. The two events were unrelated mechanically, but the practical effect on practitioners — and on parents trying to estimate support outside an attorney’s office — was the same: the two most-used calculators in California disappeared from circulation in the same year.

This post is about what filled the void, what didn’t, and what “certified” actually means under California law (it does not mean what most people think). It also covers how a free, transparent, statute-cited alternative — the calculator we built and run at cleancalc.io — fits the post-DissoMaster landscape.

The short version

• DissoMaster — discontinued by its publisher in 2025. No new updates. Existing licenses can run on old data but receive no SB 343, OBBBA, or 2026 tax-table refreshes.
• XSpouse — the active alternative in commercial bench-tool space. Subscription-priced. Used by attorneys and mediators who have replaced their DissoMaster workflow.
• California Department of Child Support Services Online Guideline Calculator — decertified late 2025 pending updates that incorporate the federal “One Big Beautiful Bill Act” (P.L. 119-21) tax changes. Expected to return after the rework lands. Until then, the link returns a notice rather than a result.
• Family Law Software — long-standing alternative in the practitioner market; survived the DissoMaster sunset; subscription-priced.
• Free / open alternatives — what most pro se litigants and mediators-on-a-budget reach for. Our calculator is one of those; we cover the differences below.

If you stopped reading here, the operational answer is: practitioners migrated to XSpouse or Family Law Software; the DCSS public calculator will return when the federal tax rework is in; and free alternatives need to be evaluated case-by-case on whether the math is current and whether the underlying assumptions are disclosed.

The longer version is more interesting, because it answers a question almost nobody is asking out loud: what makes a California child-support calculator “certified,” and does it matter for what you’re trying to do?

What “certified” actually means under California law

Two pieces of authority govern recognized calculator software:

• California Family Code §3830 — directs the Judicial Council to “approve” a uniform guideline support calculator and authorize its use in judicial proceedings.
• California Rule of Court 5.275 — sets the operational standards for approval: feature minimums, accuracy gates, audit trail requirements, version-tracking, statute parity, and the certification process the publisher must complete.

This is not “AB-1058 certification.” AB-1058 is the federal-state child-support enforcement funding mechanism that DCSS runs. People (and even some bar publications) occasionally use “AB-1058 certified” as a shorthand for “Judicial-Council-approved under §3830.” It isn’t. AB-1058 is about federal Title IV-D funding. §3830 + CRC 5.275 is what makes a calculator officially recognized in California court proceedings. The two are unrelated.

What §3830 + CRC 5.275 certification actually buys you, in practical terms:

1. Authoritativeness in court filings. A Judicial-Council-approved calculator’s printout is presumptively admissible as the guideline figure. A non-approved calculator’s printout is still admissible — anything is — but it’s evaluated as evidence, not as authority.
2. A required minimum feature set. Approved calculators must handle the full §4055 formula plus §4058 (income), §4059 (deductions), §4061-4062 (mandatory add-ons), §4057 (deviation findings), and several others. They must also handle §3600 temporary spousal support and certain tax computations.
3. An audit trail and version commitment. The publisher must maintain version history, statute-currency stamps, and an annual recertification cycle. When SB 343 lands, a certified calculator must reflect SB 343 within a defined window.
4. A statutorily-recognized publisher. The publisher signs a Judicial Council agreement. They are accountable for accuracy in a way that an open-source GitHub project simply isn’t.

The thing certification does NOT do: it does not exempt the user from §4057. California family judges retain wide discretion to deviate from any guideline result — certified or not — on stated §4057(b) findings. Certification establishes the presumption the court starts from; it does not bind the court to it.

The DissoMaster sunset, in context

DissoMaster was published for decades by The Rutter Group / Thomson Reuters. It was approved under §3830 throughout that period and was, by a wide margin, the most-deployed bench tool in California family court. Judicial officers had it on their courtroom computers. Settlement conferences ran on it. Attorneys priced consultations around the assumption that a DissoMaster printout would land on the judge’s desk.

In 2025 the publisher discontinued active development. The exact retirement mechanics — whether existing licenses continued to function in offline mode, how long support tickets remained answered — varied by license type. What was unambiguous was that no new statute or tax-table updates would ship. A tool that does not get SB 343 updates is, from September 2024 forward, computing the wrong K-factor (see our companion post on the SB 343 K-table changes). A tool that does not get One Big Beautiful Bill Act updates is, from 2026 forward, computing the wrong federal tax liability — and therefore the wrong §4059 net.

A discontinued calculator is not just inconvenient. It is actively producing wrong numbers the moment a relevant statute or tax change lands.

What replaced DissoMaster, in practice

XSpouse is the practical bench-tool successor in most counties we have heard from. It is subscription-priced, oriented at family-law attorneys and mediators rather than self-represented litigants. Its feature set covers what DissoMaster covered — §4055 guideline, §4059 net, §4062 add-ons, §3600 temporary spousal, §4057 deviation modeling — and its updates are current with SB 343 and the post-OBBBA tax tables.

Family Law Software is the other long-standing entrant in the practitioner market. Subscription-priced. Differentiates on richer financial-planning integration (asset division, support-and-tax interaction modeling, post-judgment forecasting) more than on guideline math per se. Some firms moved to it after the DissoMaster sunset; others were already there.

The DCSS Online Guideline Calculator was, until 2025, the free public option run by the California Department of Child Support Services. Pro se litigants, county self-help centers, and a substantial number of mediators relied on it. In late 2025 DCSS decertified it pending updates that incorporate the federal One Big Beautiful Bill Act, P.L. 119-21, tax changes — primarily Schedule A / SALT cap interactions and the related §163(h) mortgage-interest mechanics that flow through to §4059 net disposable income. The DCSS calculator is expected to return once the rework lands. There is no public date as of this writing.

The gap between “DissoMaster is gone” and “DCSS is offline pending rework” is what made 2025–2026 unusual: practitioners with budget migrated to XSpouse or Family Law Software; everyone else had a noticeably smaller menu of options that ran current math.

Where free alternatives fit — and where they don’t

For pro se litigants, mediators on small budgets, attorneys triaging a quick estimate before a substantive consultation, and parents who just want to see roughly where the number will land, free calculators have always served a role. The honest assessment of that role:

• A free calculator is not a substitute for §3830 certification in litigation contexts. If a number is going on a court filing, the court is going to want — at minimum — to see the inputs and the formula, and ideally to see the worksheet from an approved tool.
• A free calculator is a reasonable way to estimate the order of magnitude before deciding whether to pay an attorney for a full computation, or to sanity-check a number an attorney produced.
• A free calculator is only as good as its statute-currency discipline. A calculator that does not say which K-table version it ships and which tax year it computes against is a black box. The number it produces could be three years old.

We built cleancalc.io inside those constraints. It runs the post-SB-343 §4055 (verbatim — see our earlier post on the K-table changes). It implements the §4058 self-employment math that most W-2-shaped calculators get wrong (see our post on §4058 for 1099 and sole-prop income). It surfaces the formula and the math, not just the number. It is free, and it does not collect personal information beyond what is required to run the calculation. It does not currently hold §3830 approval — that is a multi-step process, and we have written separately about the conditions under which pursuing it makes sense for a free public tool — and so we are explicit on every page that what we produce is an estimate, not a court-authoritative figure.

If you are a self-represented litigant, the practical workflow we suggest is:

1. Run our calculator to see where the guideline lands and to see the math.
2. Print the worksheet (it is set up to attach to Form FL-342 as Item 1’s “printout of a computer calculation and findings” under §4055(b)(8)).
3. Take it to a self-help center, a county family-law facilitator, or an attorney for a substantive review before filing.

If you are an attorney or mediator, our calculator is useful as a sanity check and as a client-facing visualization — the formula and the math are visible in a way that DissoMaster and XSpouse output is not — but the court filing should still ride on an approved tool.

What this means for the next year

DCSS’s calculator returning will pull most pro se traffic back to it; that is the right outcome. Until then, the free-public market has gaps that free alternatives can fill responsibly if they are explicit about what they are and what they are not. The bench-tool market has consolidated around XSpouse and Family Law Software, and the disappearance of DissoMaster’s network effects means new entrants have more room to compete than they have had in twenty years.

SB 343’s K-table changes will start producing published appellate opinions in 2027 and beyond. The OBBBA tax changes will work their way through the §4059 deduction stack as the IRS issues regulations and California conforms. Whatever calculator you are running — bench tool, free public, or in-house — the things to check every quarter are: does it have the current K-table, does it use the current LIA threshold, and does it compute federal and state tax against the current tables. If the answer to any of those is no, the number it produces is not the guideline figure.

The single biggest practical change for self-represented litigants in this period is that the default mental shortcut — “go to the DCSS site, run the calculator, print the result, file it” — is no longer available, and won’t be until the federal-tax rework is in. Anyone walking into a self-help center in 2026 expecting that workflow to still exist is going to be redirected, and what they get redirected to varies by county. Our reading of the practitioner mailing lists is that most county facilitators are pointing people at one of: a paid practitioner running XSpouse or Family Law Software, a free alternative with a statute-currency claim that can be checked, or a continued wait for DCSS to come back online. None of those three is the obvious-default answer the prior decade trained people to expect.

What this post is not

This is a survey of the California child-support calculator landscape and a walk-through of the certification framework that determines which tools count as authoritative. It is not legal advice. The choice of which calculator to rely on in a contested case is a legal-strategy decision that benefits from a licensed California family-law attorney’s input. The disclaimer in the page footer applies to every section above.

The information about DissoMaster’s discontinuation, XSpouse’s market position, the DCSS calculator’s decertification, and the §3830 / CRC 5.275 certification framework reflects publicly available information current as of the statute_as_of date in this post’s frontmatter. Specific dates and pricing for proprietary commercial tools should be confirmed with each publisher directly before relying on them for any consequential decision.