Key Takeaways
- 1.The 2025 federal table amount for one child in BC at $95,000 income is $971/month. The recipient's income does not affect this base figure — it is determined solely by the payor's gross income and province of residence.
- 2.Section 7 expenses (daycare $800 + extracurriculars $200 = $1,000/month) are shared at each parent's net income ratio: 67.9% / 32.1%, adding ~$679/month to the payor's obligation.
- 3.Under shared custody (40%+ time each), the Section 9 set-off subtracts the recipient's table amount ($330) from the payor's ($971), reducing the base payment to $641/month.
- 4.Self-employed payors face Schedule III income adjustments — courts add back depreciation, personal expenses, and excessive deductions to determine true Guideline income.
- 5.A 10%+ income change is the practical benchmark for a material variation application. Both parents must disclose updated income annually under Section 25.
The Scenario: BC Separated Couple With One Child Age 9
This worked example uses realistic BC incomes to walk through every calculation step that the federal guidelines require. No competing calculator page provides this level of worked detail for a BC-specific scenario.
- Parent A (payor) gross income: $95,000
- Parent B (recipient) gross income: $40,000
- Number of children: 1 (age 9)
- Province: British Columbia
- Section 7 expenses: Daycare $800/month + extracurricular activities $200/month
- Custody arrangements modelled: Sole custody (Parent B primary) and shared custody (60/40)
Step 1: Look Up the 2025 Federal Table Amount
The Federal Child Support Guidelines tables are published by the Department of Justice and set a fixed monthly amount based on three variables: the payor's annual gross income, the province of residence, and the number of children. The recipient's income is irrelevant to the base table amount.
Federal Table Lookup (BC, 1 child):
Payor income: $95,000
Province: British Columbia
Number of children: 1
2025 table amount = $971/month
For context, here is how the table amount scales at nearby income levels for one child in BC:
| Payor Income | 1 Child | Monthly Difference from $95K |
|---|---|---|
| $75,000 | $772 | −$199 |
| $85,000 | $871 | −$100 |
| $95,000 | $971 | — |
| $110,000 | $1,117 | +$146 |
| $125,000 | $1,260 | +$289 |
Table amounts are approximate based on the 2025 federal tables for BC. The exact figure depends on the specific table revision in effect at the time of the order. Tables are updated to reflect changes in federal and provincial tax rates.
Step 2: Calculate Section 7 Proportional Shares
Section 7 of the guidelines addresses extraordinary expenses that the base table amount is not designed to cover. In this scenario, the child attends after-school care ($800/month) and plays competitive soccer ($200/month), for a total of $1,000/month in Section 7 expenses.
These costs are shared in proportion to each parent's net income, not gross income. The net income calculation adjusts for federal and provincial taxes, CPP contributions, and EI premiums.
Net Income Estimates (approximate):
Parent A (payor): $95,000 gross → ~$70,300 net
Parent B (recipient): $40,000 gross → ~$33,200 net
Combined net income: $70,300 + $33,200 = $103,500
Parent A's share: $70,300 ÷ $103,500 = 67.9%
Parent B's share: $33,200 ÷ $103,500 = 32.1%
Monthly Section 7 split on $1,000:
Parent A pays: $1,000 × 67.9% = $679/month
Parent B pays: $1,000 × 32.1% = $321/month
Courts may also deduct applicable tax benefits before calculating shares. For example, if the custodial parent claims the child care expense deduction (up to $8,000 for a child age 7–16), the net cost of daycare is reduced before splitting. This can shift the proportional burden slightly. For a detailed look at how BC income taxes affect take-home pay at these income levels, see our BC income tax calculator.
Step 3: Total Monthly Obligation Under Sole Custody
When Parent B has sole custody (the child lives primarily with Parent B and Parent A has standard parenting time of less than 40%), the calculation is straightforward:
| Component | Monthly Amount | Annual Amount |
|---|---|---|
| Base table amount (Section 3) | $971 | $11,652 |
| Section 7: daycare share (67.9% of $800) | $543 | $6,516 |
| Section 7: extracurricular share (67.9% of $200) | $136 | $1,632 |
| Total payor obligation | $1,650 | $19,800 |
The base table amount of $971 is non-negotiable under sole custody — the court has very limited discretion to deviate from the tables under Section 3. Section 7 expenses are added on top and require evidence that the expense is reasonable and necessary. The total $1,650/month represents approximately 20.8% of the payor's gross monthly income.
Step 4: Shared Custody Set-Off (Section 9)
When each parent has the child at least 40% of the time (roughly 146 nights per year), Section 9 of the guidelines applies. The court must consider three factors: each parent's table amount, the increased cost of shared custody (maintaining two full-time homes), and the child's condition, means, and needs.
The most widely used approach is the set-off method: calculate each parent's table amount, then subtract the lower from the higher.
Section 9 Set-Off Calculation:
Parent A table amount ($95,000, BC, 1 child): $971/month
Parent B table amount ($40,000, BC, 1 child): $330/month
Set-off: $971 − $330 = $641/month
Parent A pays Parent B: $641/month (base)
Section 9 Is Not Automatic
Unlike sole custody where the table amount is mandatory, Section 9 gives judges significant discretion. The set-off method is a starting point, not a formula. A judge can adjust the amount higher or lower based on the actual distribution of expenses, the child's standard of living in each household, and whether the lower-income parent can maintain an adequate home on the set-off amount alone. Some BC courts have ordered amounts above the set-off when the income disparity is large.
Shared Custody With Section 7 Expenses
Section 7 expenses are shared proportionally regardless of whether custody is sole or shared. Under shared custody, the total payment from Parent A to Parent B is:
| Component | Sole Custody | Shared Custody |
|---|---|---|
| Base support (table / set-off) | $971 | $641 |
| Section 7 share (67.9%) | $679 | $679 |
| Total monthly from Parent A | $1,650 | $1,320 |
| Annual total | $19,800 | $15,840 |
The $330/month difference between sole and shared custody reflects the set-off reduction. This is why the 40% parenting time threshold is so consequential — crossing it changes the entire calculation framework.
Scenario 3: What If Parent A Earns $110,000?
To illustrate how income changes affect the math, here is the same calculation with Parent A earning $110,000 instead of $95,000:
| Component | At $95K | At $110K |
|---|---|---|
| Table amount (sole custody) | $971 | $1,117 |
| Section 7 share | $679 (67.9%) | $711 (70.8%) |
| Total (sole custody) | $1,650 | $1,828 |
| Set-off (shared custody) | $641 | $787 |
| Total (shared custody) | $1,320 | $1,498 |
A $15,000 income increase (15.8%) raises the sole custody total by $178/month ($2,136/year). This demonstrates why income disclosure obligations exist and why variation applications are common after promotions or job changes.
Guideline Income for Self-Employed Parents
The guidelines do not accept the net business income on a self-employed parent's tax return at face value. Schedule III of the guidelines and Section 18 require courts to adjust income to reflect the parent's true earning capacity. This is one of the most litigated aspects of child support in BC.
- Add back non-cash deductions: Capital cost allowance (depreciation), reserve deductions, and amortization are added back to income because they reduce taxable income without reducing actual cash available for support.
- Add back personal expenses: Vehicle expenses for personal use, home office deductions beyond reasonable business use, meals and entertainment that are personal in nature — all are added back.
- Corporate income adjustment: If the parent owns a corporation, the court can look through the corporate structure and attribute pre-tax corporate income to the parent, not just the salary or dividends actually paid out.
- Income averaging: Courts typically use a three-year average for self-employed income to smooth fluctuations. If income is trending consistently upward or downward, the court may weight recent years more heavily.
- Imputed income: If the court finds that a parent is deliberately underemployed or structuring their business to minimize support, it can impute income at a level the parent is capable of earning. This applies to both self-employed and employed parents.
For a related scenario involving self-employment income calculations, see our BC common-law separation asset split calculator.
Annual Income Disclosure Obligations
Section 25 of the Federal Child Support Guidelines requires both parents to provide updated income information on request and, in many cases, annually. This obligation continues for as long as the child support order is in effect.
- What must be disclosed: A copy of the most recent tax return, the Notice of Assessment from the CRA, and (for self-employed parents) financial statements for any business or corporation.
- Timeline: The payor must provide updated income documents within 30 days of receiving a written request. Many separation agreements and court orders set an annual exchange date (commonly by June 30 for the prior tax year).
- Consequences of non-disclosure: If a parent refuses to provide income information, the court can impute income, draw adverse inferences (assume the non-disclosing parent earns more than claimed), or hold the parent in contempt.
The 10% Variation Trigger: When to Apply to Change the Order
Either parent can apply to vary a child support order when there has been a “material change in circumstances.” While the Family Law Act and the Divorce Act do not define a specific percentage, BC courts and family law practitioners use a roughly 10% change in the payor's income as the practical threshold for a variation application.
| Income Change | New Table Amount | Monthly Change | Likely Variation? |
|---|---|---|---|
| $95K → $99K (+4.2%) | $1,011 | +$40 | Unlikely |
| $95K → $105K (+10.5%) | $1,069 | +$98 | Yes |
| $95K → $110K (+15.8%) | $1,117 | +$146 | Yes |
| $95K → $80K (−15.8%) | $822 | −$149 | Yes (payor applies) |
Variation applications cost time and legal fees. A $40/month change is unlikely to justify the cost of a court application, while a $146/month change ($1,752/year) clearly does. Some separation agreements include automatic adjustment clauses tied to income changes, avoiding the need for a formal variation. For more on the financial dynamics of separation in BC, see our BC RRSP divorce transfer calculator.
The 2025 Federal Table Update: What Changed
The federal child support tables are recalculated periodically to reflect changes in federal and provincial tax rates, the basic personal amount, CPP and EI contribution rates, and other tax parameters. The 2025 update adjusted table amounts across all income levels and provinces.
- Why amounts change: The tables embed the after-tax cost of transferring money from the payor to the recipient. When tax rates change (e.g., the basic personal amount increased to $16,129 federally in 2025), the amount of pre-tax income needed to deliver the same after-tax benefit changes.
- Impact on existing orders: An existing order based on the prior tables is not automatically updated. Either parent must apply to vary the order using the new tables. If the table revision changes the amount by a material threshold, this alone can constitute a change in circumstances.
- Retroactive adjustments: Courts can order retroactive support adjustments, typically for up to three years, if a parent failed to disclose an income change or apply for a variation in a timely manner.
Split Custody: When Each Parent Has Primary Care of a Different Child
While our scenario involves only one child, it is worth noting how split custody (Section 8) differs from shared custody. Split custody applies when each parent has primary care of at least one child — for example, a 12-year-old living with Parent A and an 8-year-old living with Parent B.
Under split custody, each parent's table amount for the child(ren) in the other parent's care is calculated, and the difference is the net payment. This is conceptually similar to the shared custody set-off but applied at the child level rather than the time level. For an analysis of how asset division works alongside support obligations in divorce, see our Ontario divorce equalization payment calculator.
Complete Payment Summary: All Arrangements Compared
Here is a side-by-side comparison of every arrangement modelled in this article:
| Arrangement | Base Support | Section 7 Share | Monthly Total | Annual Total |
|---|---|---|---|---|
| Sole custody (base only) | $971 | — | $971 | $11,652 |
| Sole custody + Section 7 | $971 | $679 | $1,650 | $19,800 |
| Shared custody (set-off only) | $641 | — | $641 | $7,692 |
| Shared custody + Section 7 | $641 | $679 | $1,320 | $15,840 |
The difference between sole and shared custody with Section 7 expenses is $330/month ($3,960/year). This gap is driven entirely by the set-off of the recipient's table amount ($330) against the payor's table amount ($971). For related analysis on financial planning during separation, see our pension division calculator for divorce.
Important Disclaimer
This article provides general information about child support calculations under the Federal Child Support Guidelines as applied in British Columbia. It is not legal or financial advice. The table amounts referenced are based on the 2025 federal tables and are approximate — exact amounts depend on the specific table revision in effect at the time of the order. Section 7 expense sharing, Section 9 shared custody calculations, and self-employed income adjustments all involve judicial discretion and may vary by case. Child support obligations are governed by the Divorce Act (for divorcing spouses) and the BC Family Law Act (for unmarried parents and other family structures). Consult a qualified family law lawyer in British Columbia for advice specific to your circumstances. The amounts in this article are illustrative only and should not be relied upon as a substitute for legal advice or an official child support determination.