§4062 mandatory add-ons: childcare and uninsured medical, apportioned the right way

The §4055 guideline formula we walked through in the SB 343 K-table post computes a monthly support number. That number is most of the answer. It is not all of the answer.

California Family Code §4062 adds two categories of expense on top of the §4055 amount: childcare costs related to employment or job training, and reasonable uninsured health-care expenses for the children. The statute calls these mandatory add-ons — meaning the court is required to order them, separately from the guideline figure, in any case where they apply. §4061 controls how they are apportioned between the parents — and the apportionment rule is more nuanced than the “split it 50/50” intuition most people walk in with.

This post is the §4062 / §4061 walk-through. What the statute mandates, what counts (and what doesn’t), how the apportionment math actually works, and the practical gotchas that turn up when an order has to specify monthly amounts. The post complements the §4057 deviation piece — when §4062 doesn’t fully cover a child’s actual costs, the §4057(b)(5)(C) “extraordinary needs” deviation is the statutory bridge.

What §4062 actually says

§4062 reads, verbatim (from the current text at leginfo.legislature.ca.gov):

(a) The court shall order the following as additional child support:

(1) Childcare costs related to employment or to reasonably necessary education or training for employment skills.

(2) The reasonable uninsured health care costs for the children as provided in Section 4063.

(b) The court may order the following as additional child support:

(1) Costs related to the educational or other special needs of the children.

(2) Travel expenses for visitation.

The structure is two-tier. Section (a) is mandatory — “the court shall order” — for two specific categories. Section (b) is permissive — “the court may order” — for two others. The mandatory categories matter most in practice because they show up in nearly every case with minor children: someone has childcare costs, and somebody is going to need a doctor’s visit the insurance doesn’t fully cover.

The statute’s spareness is intentional. The categories are described in broad terms (childcare “related to” employment; “reasonable” uninsured health care costs) and the operational details — which expenses count, what “reasonable” means, when an expense is “uninsured,” how the parties document it — fall to the court’s case-by-case discretion. The boundaries get litigated. They are not self-executing.

§4061: how mandatory add-ons are apportioned

§4062 says the court must order add-ons. §4061 says how to split them. Verbatim from the current §4061:

(a) The amounts in addition to the guideline support amount under subdivision (a) of Section 4062 shall be divided one-half to each parent, unless either parent requests a different apportionment pursuant to subdivision (b)…

(b) If requested by either parent, and the court determines that the application of subdivision (a) would be unjust or inappropriate in the particular case, the court shall apportion these expenses in proportion to the parents’ net disposable incomes, as adjusted pursuant to subdivision (c).

That is the operative rule, with one important wrinkle hidden in subdivision (c): when the court does the §4061(b) net-disposable-income apportionment, it first reduces the higher-earner’s NDI by the §4055 guideline support amount they are already paying, and adds it back to the lower-earner’s NDI. The apportionment then runs on the post-guideline NDI shares — not the pre-guideline shares.

So §4061’s algorithm is:

1. Default: 50/50 split of §4062(a) add-ons.
2. On request, when 50/50 is “unjust or inappropriate”: apportion based on post-§4055 net disposable income shares.
3. Permissive add-ons under §4062(b): the court has discretion on apportionment; not bound by §4061(a)‘s default.

The “unjust or inappropriate” finding is the gate. A parent who wants the income-proportional split has to request it, and the court has to find the default unfair on the facts. In practice, when the income asymmetry is meaningful — say, one parent earns three or four times what the other does — courts routinely find 50/50 unjust and apportion proportionally. When the parents’ incomes are close, courts default to 50/50.

What counts (and what doesn’t)

§4062(a)(1) childcare

The statute requires that childcare be “related to employment or to reasonably necessary education or training for employment skills.” Three categories generally qualify without controversy:

• After-school programs while the custodial parent works.
• Day care during the workday for younger children.
• Childcare during job training or education that leads to employment (community college coursework toward a credential, vocational training, etc.).

Categories that do not qualify under (a)(1):

• Babysitting for a parent’s social activities or personal time.
• Sports, music lessons, or enrichment activities — these are not “childcare related to employment” even if they happen during work hours. They might qualify under §4062(b)(1) educational/special-needs add-ons at the court’s discretion.
• Costs incurred by a parent during their custody time but not for the purpose of enabling them to work.

The practical evidence question is “what is this expense actually for?” — and the burden is on the parent claiming the add-on to document the work-related purpose.

§4062(a)(2) uninsured medical

§4063 cross-references and defines the universe: “uninsured health-care costs” includes the children’s reasonable costs for medical, dental, vision, mental health, and prescription expenses after any insurance reimbursement. Categories that consistently qualify:

• Insurance deductibles and copays attributable to the children’s care.
• Out-of-pocket prescription costs for the children’s medications.
• Orthodontia not covered by dental insurance.
• Mental-health therapy and counseling.
• Co-insurance amounts the family pays before insurance kicks in.

The “reasonable” qualifier matters at the margins. Concierge medicine, elective cosmetic procedures, alternative-medicine practitioners outside the insurance network, and similar high-cost choices typically don’t qualify without specific showing that the cost was medically necessary. Documented diagnostic and treatment costs for the children’s actual conditions do qualify, even when they are large.

§4063 also imposes a procedural obligation: a parent who pays an uninsured medical expense must request reimbursement from the other parent within a reasonable time, and the other parent must respond promptly. Sleeping on a claim for months and then demanding reimbursement is one of the recurring §4063 gotchas — courts have authority to deny reimbursement when the requesting parent’s delay prejudiced the responding parent.

The math, with a worked example

A real fact pattern, sanitized:

• Parent A: net disposable income $7,000/month, 30% custody timeshare.
• Parent B: net disposable income $3,000/month, 70% custody (primary).
• Two children, one in after-school care at $600/month, both kids’ uninsured medical averaging $200/month combined across deductibles, copays, and prescriptions.
• TN = $10,000. Post-SB-343 §4055 K-band at TN = $10,000 → 0.250 income fraction (the new $5,001–$10,000 band).
• Timeshare multiplier for H% = 0.30 → 1.30.
• K = 1.30 × 0.25 = 0.325.
• Multi-child multiplier for two kids → 1.6.

Run the §4055 formula. CS = 0.325 × ($7,000 − 0.30 × $10,000) × 1.6 = 0.325 × $4,000 × 1.6 = $2,080/month in guideline support. (Our calculator confirms this end-to-end on the post-SB-343 K-table.)

Now apply §4062(a). Total §4062(a) add-ons = $600 childcare + $200 uninsured medical = $800/month.

Default §4061(a) split: $400/month from each parent.

§4061(b) income-proportional split (on request, after a finding that 50/50 is unjust): the court first adjusts NDI. Parent A’s post-guideline NDI = $7,000 − $2,080 = $4,920. Parent B’s post-guideline NDI = $3,000 + $2,080 = $5,080. (Counter-intuitive but exactly how §4061(c) computes it.) Total post-guideline NDI = $10,000 (unchanged in aggregate). Parent A’s share = $4,920 / $10,000 = 49.2%. Parent B’s share = 50.8%.

Parent A’s add-on contribution under §4061(b): 49.2% × $800 = $394/month. Parent B’s add-on contribution under §4061(b): 50.8% × $800 = $406/month.

Notice what just happened. Under §4061(a), Parent A (the higher earner) pays $400 — exactly half. Under §4061(b), Parent A pays $394 — less than half — because the §4055 guideline support already shifted nearly $2,100/month of buying power from Parent A to Parent B, and the §4061(b) apportionment runs on post-guideline shares. The income-proportional rule, in many cases, makes the high earner’s add-on burden smaller than the default 50/50.

That is the §4061(c) anomaly. It is one of the most frequently-misunderstood pieces of guideline math. The plain-English intuition is “income-proportional means the high earner pays more”; the actual rule is “income-proportional means the post-guideline high earner — who is no longer as relatively high-income as they used to be — pays more.” Where the §4055 figure is large relative to the parents’ incomes, the §4061(c) adjustment can flip the apportionment closer to even than the default.

The strategic implication: a low-earning parent who reflexively requests §4061(b) apportionment because “it’s only fair the higher earner pays more” may end up worse off than under the §4061(a) default. The §4061(c) adjustment has to be computed before the request makes strategic sense.

§4063: the reimbursement procedure most parties miss

§4062(a)(2) tells you what counts. §4063 tells you what you have to do when one parent has paid an uninsured medical expense and the other parent’s share is owed.

The statute requires the paying parent to provide an itemized statement of the costs to the other parent within a reasonable time after they accrue, and the other parent to reimburse the requested share within 30 days of receiving notice. If they dispute the charge, they have to do that within 30 days too — they cannot sit on a claim indefinitely and then contest it months later.

Practical failure modes the cases see repeatedly:

• The custodial parent accumulates a year of pediatrician copays and prescription costs without sending itemized statements, then files a request for $4,000 in back-reimbursement at a subsequent hearing. Trial courts have discretion to deny stale claims under §4063 — and they exercise it.
• The non-custodial parent receives an itemized statement, ignores the 30-day deadline, then disputes the charges six months later when the issue surfaces at a review hearing. The dispute is generally untimely; the statement, if reasonable on its face, is treated as confirmed.
• Either parent pays a non-network provider out of pocket without first checking whether insurance would have covered the cost in-network. Courts often refuse reimbursement for the avoidable cost differential.

The §4063 procedural discipline is more litigated than most people expect. Cleaning up the reimbursement workflow — itemized statements every month, prompt response within the 30-day window — eliminates the bulk of the §4063 dispute volume.

Common gotchas

A short list of the §4062 / §4061 issues that turn up most often:

• Confusing §4062(a)(1) childcare with §4062(b)(1) educational add-ons. Private school tuition, tutoring, and enrichment programs are not §4062(a)(1) childcare — they’re §4062(b)(1) educational/special-needs add-ons, which are permissive (the court “may” order them) rather than mandatory. The same monthly invoice may qualify under different statutory authority depending on whether the program is enabling a parent to work or developing the child’s education.
• Not requesting §4061(b) apportionment until after the §4055 calculation is on the record. §4061(b) requires the moving party to request the income-proportional split. A parent who simply assumes the court will apportion proportionally because of income asymmetry — without filing the request — gets the §4061(a) 50/50 default. The request has to be on the record.
• Treating new spouse income as part of NDI for §4061(c) apportionment. A new spouse’s wages affect the federal tax allocation under Marriage of Carlsen but do not become the supporting parent’s own NDI for §4061 apportionment. Add-on shares are computed on each parent’s own post-§4055 NDI, not on a household-level figure.
• Missing the §4061(c) adjustment entirely. The §4061(b) request without the §4061(c) adjustment produces the wrong number. The adjustment subtracts guideline support from the payor’s NDI and adds it to the recipient’s before computing income shares. Skipping this step and using raw pre-guideline NDI shares overstates the higher earner’s apportionment by exactly the §4055 guideline amount as a fraction of total income.
• Not specifying a monthly amount. §4062(a) orders that simply say “the parents shall share equally in childcare and uninsured medical” without a monthly dollar amount create enforceability problems. The order should specify either a monthly average (e.g., “$400/month childcare to be paid by Parent A on the 1st of each month”) or an itemized-bill reimbursement mechanism under §4063 — preferably both, with the monthly figure as a baseline and §4063 reconciliation true-ups quarterly.

When §4062 doesn’t cover the actual cost — and §4057 takes over

§4062(a)(2) captures “reasonable” uninsured health-care costs. It does not capture all of the children’s costs, even when those costs are documented and large. Specifically, special-needs care — therapies, equipment, specialists, developmental services — often exceeds what a court will treat as “reasonable” routine medical care under §4062.

When that happens, the statutory bridge is §4057(b)(5)(C) — the “extraordinary needs” deviation we walked through in the §4057 deviation post. §4057(b)(5)(C) authorizes an upward deviation from the §4055 guideline figure to fund documented additional costs the §4062 add-on regime doesn’t fully reach.

The procedural distinction matters. §4062 add-ons are separate from the §4055 guideline figure and are ordered as an addition to it. A §4057(b)(5)(C) deviation modifies the §4055 figure itself. They can stack — a court can order both — but they live on different lines of the FL-342 worksheet, and a motion has to specify which authority it is invoking. Pleading “increase the support for special-needs costs” is not enough; the motion has to identify whether the relief is sought under §4062, under §4057(b)(5)(C), or both.

What this post is not

This is an engineering walk-through of §4062 / §4061 / §4063 and the §4055 ↔ §4057 interaction that determines how mandatory add-ons get into a child-support order. It is not legal advice. The choice of whether to request §4061(b) apportionment, what evidence to produce for “reasonable” uninsured medical, and whether to pursue a §4062 add-on, a §4057(b)(5)(C) deviation, or both, depends on case-specific facts that a licensed California family-law attorney can evaluate. If your case has meaningful add-on costs or income asymmetry, a substantive attorney review before motion or stipulation is genuinely load-bearing.

Two related pieces worth reading alongside this one: our walk-through of the §4055 K-table changes under SB 343 (because the §4055 figure is the input to every §4061(c) adjustment), and our piece on §4057 deviation (because when §4062 doesn’t reach the actual costs, §4057(b)(5)(C) is where the case goes).

The statute text quoted above was current as of the statute_as_of date in this post’s frontmatter; we re-verify all citations quarterly. The page footer’s disclaimer applies to every section above.