What you’ll be able to do
Identify the 2026 limits and shared caps that apply across household retirement accounts.
Allocate an annual deposit target through employer matches, HSA, IRAs, and workplace or self-employed plans.
Recognize potential mega-backdoor Roth capacity and intentional taxable-brokerage overflow.
Chapter 8.1
Understand the step
Start with the principle, then connect it to the numbers and tradeoffs that shape the decision.
The lesson
Step 7 chose the retirement account types. Step 8 turns the retirement target into a coordinated annual deposit plan. The goal is not to chase every maximum blindly; it is to place each available dollar intentionally, capture employer money, respect shared limits, and automate the remaining 2026 contributions.
Where this step fits
Step 7 chooses the tax-advantaged account jobs. Step 8 coordinates household contribution limits, employer plans, and self-employed options around the Step 3 retirement target. Step 9 directs true excess toward flexible taxable investing.
Use the retirement target before using the limits
Bring the annual savings requirement connected to the Step 3 retirement number. Confirm the starter and full emergency reserves, high-interest debt work, and near-term obligations remain stable. A legal maximum is only account capacity; it does not answer how much this household should save or whether cash flow can support it.
- Protect every affordable Step 2 employer match.
- Use raises, completed savings transfers, and eliminated debt payments before lifestyle inflation absorbs them.
- Compare the total contribution plan with the retirement target and the next incomplete Blueprint priority.
Separate employee deferrals from total plan additions
For 2026, the standard employee deferral limit for a 401(k), 403(b), TSP, and governmental 457(b) is $24,500. Plans may permit an $8,000 catch-up beginning at age 50 or an $11,250 catch-up for someone who is age 60 through 63 during 2026. Traditional and Roth employee deferrals use the same employee limit; choosing both does not double it.
- The defined-contribution annual-additions ceiling is generally the lesser of $72,000 or 100% of eligible compensation for the plan.
- Employee base deferrals, employer matches, nonelective contributions, voluntary after-tax contributions, and forfeitures generally count toward annual additions; eligible catch-up contributions generally do not.
- No more than $360,000 of compensation can be considered for certain 2026 contribution calculations.
- Employer contributions generally do not reduce the employee's $24,500 deferral limit, but they can reduce remaining $72,000 plan capacity.
One person can have several plans without receiving several personal limits
Employee deferrals to 401(k), 403(b), TSP, SIMPLE, and Solo 401(k) arrangements generally aggregate by person. A governmental 457(b) has a separate limit, although employee and applicable employer contributions share that 457(b) limit. Each spouse has their own individual employee-deferral capacity.
- Traditional and Roth IRAs share one $7,500 per-person 2026 limit, or $8,600 at age 50 and older.
- The IRA limit is also constrained by taxable compensation, and Step 7's Roth MAGI rules still apply.
- Employee and employer HSA contributions share the $4,400 self-only or $8,750 family 2026 limit. Eligible age-55 catch-ups belong in the eligible spouse's own HSA.
- A family HSA base limit is shared by the household; it is not multiplied because both spouses have HSA accounts.
Allocate matches first, then move through the tax-advantaged layers
The calculator follows a decision-first order: capture every affordable match, fill an eligible HSA, fund each IRA path selected in Step 7, use remaining regular workplace or self-employed capacity, evaluate confirmed mega-backdoor capacity, and identify any remaining amount for the Step 9 taxable-brokerage decision.
- The Roth preference does not override direct-contribution phaseouts, pro-rata exposure, or an unavailable Traditional IRA deduction.
- When the annual budget cannot capture every match, direct dollars toward the highest match returned per employee dollar while checking each plan's actual tiered formula.
- For married households, coordinate both spouses' plan quality, fees, investment menus, tax treatments, and payroll deadlines rather than defaulting every dollar to one spouse's plan.
A business owner can contribute in employee and employer roles
A Solo 401(k) can accept employee deferrals and an employer contribution, but the owner's employee deferral is still shared with other 401(k), 403(b), TSP, and applicable salary-reduction plans. A SEP IRA generally receives employer contributions rather than elective employee deferrals. A SIMPLE IRA uses its own lower plan limit while still interacting with the person's aggregate deferral rules.
- The 2026 SEP ceiling is $72,000, also subject to compensation and contribution-rate rules.
- The standard 2026 SIMPLE employee limit is $17,000; certain qualifying plans may use an enhanced $18,100 limit, with separate catch-up rules.
- Gross business receipts are not eligible compensation. Net earnings, entity structure, self-employment tax adjustments, plan terms, and employee obligations can change the allowable employer contribution.
- Use the IRS worksheet, plan provider, or tax professional to calculate employer capacity before entering it in the allocator.
A mega backdoor Roth requires two separate plan features
A Roth 401(k) contribution is a normal elective deferral and remains inside the personal employee limit. A mega backdoor Roth instead begins with voluntary after-tax employee contributions beyond that limit, then moves those dollars through an in-plan Roth conversion or an eligible in-service distribution to a Roth IRA. It is also separate from Step 7's backdoor Roth IRA strategy.
- High income does not create access. The plan must accept voluntary after-tax contributions and provide a usable Roth conversion path.
- Capacity is generally the lesser of $72,000 or 100% of eligible compensation, minus base employee deferrals, employer contributions, other annual additions, and after-tax contributions already made.
- Earnings before conversion may be taxable, and plan fees, conversion frequency, nondiscrimination testing, and operational limits can reduce the practical amount.
- For 2026, certain age-50 catch-up contributors with more than $150,000 of prior-year wages from the plan sponsor may need those catch-up dollars designated as Roth. Verify the plan's implementation and the wage definition.
Convert the annual plan into payroll and recurring transfers
Subtract amounts already contributed, divide the remaining allocation by the remaining payroll or transfer periods, and schedule each election. Front-loading can increase time invested, but a plan that matches each paycheck without a true-up can leave employer money unclaimed after contributions stop early.
- Confirm whether bonuses use the same election and match formula.
- Review contributions after compensation changes, job changes, and plan-provider updates.
- Stop or redirect transfers when a limit is reached rather than allowing excess contributions to create a correction problem.
- When useful tax-advantaged capacity is full, preserve the habit and direct true excess to the Step 9 taxable-brokerage decision.
Know the math
Annual deposit target
Annual deposit target = household gross earned income x chosen retirement savings percentage
Use a dollar target instead when the retirement plan calls for a specific annual amount.
Remaining contribution election
Per-period contribution = (annual account target - contributed year to date) / remaining contribution periods
Payroll rounding and plan deadlines can change the final election, so review the last pay period before year-end.
Shared employee-deferral capacity
Remaining shared deferral = personal 2026 limit - employee deferrals already made across covered plans
Traditional and Roth designations do not create separate employee limits, and changing employers does not reset the personal limit.
Mega-backdoor Roth capacity
Capacity = lesser of $72,000 or 100% of eligible compensation - base employee deferrals - employer contributions - other annual additions
Eligible catch-up contributions generally sit outside the $72,000 annual-additions calculation. Actual plan capacity may be lower.
Simplified current tax reduction
Estimated tax reduction = federal tax before pre-tax contributions - federal tax after contributions + state-eligible pre-tax dollars x entered state marginal rate
This estimate does not model credits, local taxes, payroll taxes, AMT, QBI, itemized deductions, or every state rule.
Chapter 8.2
See it in practice
Turn the idea into a concrete example, then use the product-aligned visual to make the pattern easier to recognize.
Interactive lesson
Enter household income, account access, match formulas, year-to-date contributions, HSA and IRA choices, and confirmed mega-backdoor features. The allocator places the annual deposit target in Blueprint order and shows each 2026 limit in progress.
Household target
Define the dollars available for 2026
This is a deposit target. Employer money from an unrelated employer is added above it; current-year tax savings are shown separately.
Account access
Add workplace and self-employed plans
Match inputs use the Step 2 single-rate formula. For tiered matches, confirm the equivalent full-match requirement in the plan document.
401(k)You
Advanced plan details
Use these fields when you already contributed this year, have multiple plans, or confirmed mega-backdoor Roth features.
HSA eligibility
Add an HSA only when eligible
Eligibility generally requires qualifying high-deductible health coverage. Employee and employer deposits share the annual limit.
IRA access
Your IRA
The calculator estimates Roth eligibility from filing status, gross income, and modeled pre-tax contributions. The backdoor confirmation appears only when the direct Roth path may be reduced or unavailable.
Live 2026 allocation
Put each available dollar in order
- Total deposited including employer
- Annual deposit target
- Already contributed
- Per remaining period
- Employer money
- Estimated current tax reduction
Full direct Roth eligibility
The entered 2026 MAGI is at or below the phaseout starting point for this filing status.
Estimated from the household income, filing status, selected state, and modeled pre-tax contributions: 24% federal plus 9.30% state. Local taxes and state-specific deductions are not modeled.
Your account
Per remaining period
Already contributed
Add from here
Employer amount
$4,500.00 projected employer contribution
Household account
Per remaining period
Already contributed
Add from here
Employee and employer HSA deposits share this coverage-based limit.
Your account
Per remaining period
Already contributed
Add from here
Confirm payroll and provider deadlines before changing contributions.
These tools are provided for educational purposes only and do not constitute financial, investment, tax, legal, or planning advice. Results are estimates based on the assumptions you provide, and actual outcomes may differ. Past performance is not indicative of future returns. Consider consulting a qualified professional before making financial decisions.
The model uses 2026 federal limits, the standard deduction, a representative state marginal-rate estimate, fixed single-rate matches, and the information entered above. It does not model credits, AMT, local taxes, payroll taxes, QBI, every state deduction or surtax, nondiscrimination testing, every catch-up exception, or plan-specific deadlines. Verify limits and elections with current IRS guidance, plan administrators, and qualified professionals.
$30,000 single-earner contribution plan
A 35-year-old earns $150,000, has a Traditional 401(k) matching 50% up to a 3% employer contribution, qualifies for a self-only HSA, remains directly eligible for a Roth IRA, and has $30,000 available to deposit.
Contributing $9,000 first captures the $4,500 match. The plan then allocates $4,400 to the HSA, $7,500 to the Roth IRA, and the remaining $9,100 back to the 401(k). Personal deposits total $30,000, while $34,500 reaches the accounts after employer money.
Key takeaways
- Start with the retirement target; a contribution limit is capacity, not a personalized savings requirement.
- Coordinate shared employee, IRA, HSA, employer, and annual-additions limits across the household before changing payroll.
- A mega backdoor Roth requires voluntary after-tax contributions plus a real conversion path; high income alone is not enough.
- Convert the remaining annual amount into automated payroll and account transfers, then send only true excess to Step 9.
Two spouses, individual and household limits
Both spouses have workplace plans and IRAs, while the household uses family HSA coverage.
Each spouse evaluates their own workplace and IRA limit. The $8,750 family HSA base limit is coordinated across both spouses and includes employer deposits rather than becoming $8,750 per spouse.
$35,000 of potential mega-backdoor capacity
An employee has $250,000 of eligible compensation, contributes the $24,500 base employee deferral, and expects $12,500 of employer contributions. The plan confirms voluntary after-tax contributions and an in-plan Roth conversion path.
$72,000 - $24,500 - $12,500 leaves $35,000 of simplified annual-additions capacity. Other additions, plan restrictions, testing, and compensation definitions must still be checked before contributing.
Solo 401(k) after a workplace deferral
A business owner already deferred $10,000 into a 401(k) through a W-2 job and also has a Solo 401(k).
The Solo 401(k) does not create a second $24,500 employee limit. The remaining employee capacity is coordinated across both plans, while a separate business employer contribution uses plan-eligible compensation and the self-employed calculation.
Chapter 8.3
Make the decision
Use the Blueprint order of operations and the Decision Framework to choose a next move that fits your household.
Think through the tradeoff
Maximize the plan, not just an account
Start with the amount the retirement target requires, then coordinate it across the household. A contribution limit is capacity, not proof that using every dollar of it is automatically the right decision.
Every dollar still has a job
Capture employer money, use the tax-advantaged accounts selected in Step 7, and preserve the Blueprint foundation. Only true excess moves toward a mega backdoor Roth or the taxable investing work in Step 9.
Plan documents control execution
IRS limits describe the tax-law ceiling, while the employer plan can impose lower limits, payroll windows, testing restrictions, and different match timing. Verify the final election with the plan administrator.
Chapter 8.4
Take the next step
Go deeper only where it helps the decision, then continue through the Blueprint or turn the lesson into your roadmap.
Step 2: Employer Match
Confirm the match formula and contribution required for the full employer contribution.
Open resourceStep 3: Retirement Number
Reconnect annual contributions to the retirement target they are meant to fund.
Open resourceStep 7: HSA and IRA Decisions
Review HSA priority, Roth eligibility, backdoor Roth rules, and tax-bucket tradeoffs.
Open resourceStep 9: Taxable Brokerage
Give dollars beyond useful tax-advantaged capacity an intentional next destination.
Open resourceBuild My Money Plan
Connect contribution targets, account balances, and the retirement projection in one roadmap.
Open resourceOfficial sources and research
- 2026 retirement contribution and Roth phaseout adjustmentsInternal Revenue Service
- 401(k) and profit-sharing plan contribution limitsInternal Revenue Service
- Salary deferrals when eligible for more than one planInternal Revenue Service
- 2026 HSA inflation-adjusted limitsInternal Revenue Service
- IRA contribution limitsInternal Revenue Service
- One-participant 401(k) plansInternal Revenue Service
- SEP contribution limitsInternal Revenue Service
- Designated Roth accounts and in-plan rolloversInternal Revenue Service
- Catch-up contribution rulesInternal Revenue Service
Step 8 of 11
Stage 4: Build Wealth
Turn this lesson into your roadmap
Build a free My Money Plan so this Blueprint step becomes a practical action plan for your household.
