A freelancer’s retirement money has three main doors, and walking through the wrong one can cost real money over a career. There is no employer plan to default into, no human resources form that enrolls you while you think about something else, and no match that arrives whether you pay attention or not. What you do have is a choice among powerful accounts, each built for a different kind of self-employment. Compared on the same terms — how much you can put in, who can contribute, how simple it is to run, and what happens when your business changes — the right door usually becomes clear.
Door One: The Solo 401(k), the Heavyweight
The Solo 401(k) is built for a business owner with no employees other than a spouse. Its power comes from letting you wear two hats at once. As your own employee, you can defer up to $23,500 of pay. As your own employer, you can add roughly 25 percent of compensation, up to a combined $70,000, or $77,500 past fifty. Those figures are as currently published — the limits are adjusted over time, so confirm the current year’s figures for the year you open and fund the account.
On the same terms as the other doors, the Solo 401(k) wins on capacity, especially at modest income. Because the employee deferral is a flat amount rather than a pure percentage of profit, a freelancer earning $40,000 or $50,000 can shelter far more here than in a percentage-only plan. Many Solo 401(k) plans also allow Roth contributions, which means paying tax now for tax-free withdrawals later, and many allow loans, which gives the money a limited emergency use that IRA-based plans do not offer. The costs are paperwork and attention. Setup takes longer than an IRA. Once the balance grows past the reporting threshold, an annual filing duty arrives. The plan also has a strict shape: it is solo by design, and that shape breaks when real employees arrive.
Door Two: The SEP IRA, the Simple Alternative
The SEP IRA takes the opposite trade. It can be opened in about ten minutes at most brokerages, it carries no annual filings for most small accounts, and the rule a freelancer needs to remember fits in one line. Only the employer contributes — which, for a solo worker, still means you — up to about 25 percent of net self-employment earnings, with the same $70,000 ceiling as the Solo 401(k). Confirm the current year’s figures before relying on that ceiling, since the limits are adjusted over time.
Judged on simplicity, the SEP wins easily. Judged on capacity at lower income, it loses, because there is no employee-deferral piece. At $40,000 of net earnings, a percentage-only contribution is far smaller than what the Solo 401(k) can shelter with its deferral plus employer piece. There is also no Roth flavor in a standard SEP setup, so contributions go in pre-tax and withdrawals in retirement are taxed. Flexibility is the SEP’s quiet strength. In a strong year you can fund it heavily. In a weak year you can contribute little or nothing without unwinding anything. For a freelancer who values a clean desk over maximum shelter, that trade is honest and often right.
Door Three: The SIMPLE IRA, the Middle Ground
The SIMPLE IRA matters mostly once a freelancer has a few employees. It allows employee deferrals plus required employer contributions, with lower limits than the two doors above and rules designed to keep administration light for a small team. A solo freelancer rarely chooses it first, because the Solo 401(k) shelters more and the SEP is simpler. Its place in the comparison is the bridge case: you have outgrown working entirely alone, you are not ready for a full company 401(k), and you need a plan that covers a small staff without heavy cost. If that description does not fit you yet, note the door and move on. It becomes relevant on hiring day, not before.
The Same Income, Run Through Each Door
Numbers make the comparison concrete. Take $80,000 of net self-employment income. A SEP IRA shelters roughly $20,000, about 25 percent of that income, and then it stops. A Solo 401(k) starts with the $23,500 employee deferral and then adds a similar employer piece on top, sheltering well over $40,000 in total at that income, subject to the exact compensation calculation for your business structure. That gap is why higher earners migrate to the Solo 401(k) even though they dislike its paperwork. At lower income the gap matters even more in percentage terms, because the flat deferral does work that a pure percentage cannot.
At very high income, the two main doors meet at the same combined ceiling, and the SEP’s simplicity can look attractive again if you know you will max out either way. At modest and middle income, which is where most freelancers live, capacity per dollar earned is the deciding term, and the Solo 401(k) holds it. Taxes refine the choice further. Pre-tax contributions lower this year’s bill. Roth contributions raise this year’s bill in exchange for tax-free money later. The comparison material on Roth IRA vs 401(k) for young workers lays out that timing trade in more detail, and the official rules for every plan in this comparison live at the IRS’s pages on retirement plans for the self-employed.
The Supporting Instruments
Two accounts support the main door rather than replacing it. A Roth IRA on top of your main plan, at $7,000 a year at current limits — confirm the current year’s figures — gives you tax-free growth and tax-free retirement withdrawals, plus a pot of money governed by different rules than your workplace-style plan. It is especially valuable in a lean year, when your tax rate is low and paying tax now costs less than it will later. Fund it alongside the main plan when cash allows, not instead of a plan that can shelter far more.
An HSA does double duty for freelancers on a high-deductible health plan. Money goes in tax-deductible, grows without tax, and comes out tax-free when spent on medical costs. Receipts can be saved and reimbursed later, which lets the account act partly as a health fund and partly as a long-term savings vehicle. It is not open to everyone, since it depends on your health coverage, but freelancers who qualify and ignore it are leaving a useful tool unused.
How the Money Actually Gets Saved
Choosing a door solves only half the problem. The other half is a transfer habit that survives irregular income. The method that works for most freelancers is the percentage method: about 15 percent of every client payment moves to retirement the day it arrives, before it mixes with spending money. A freelancer’s monthly contribution, set as a fixed amount and left to willpower, dies in the first lean month. A percentage taken at the moment of payment scales up in good months and down in bad ones without a fresh decision each time.
Lean months still need a rule, because zero becomes a habit faster than any other number. Set a floor amount instead of zero — a small transfer you can make even in a poor month — and then use a catch-up quarter after strong months to restore the annual pace. The target to aim at is 15 to 20 percent of net income. Starting at 10 percent and adding a point a quarter is a legitimate way to get there if the full rate would break your budget today. Inside the account, keep the investing simple: a target-date fund or a three-fund portfolio does the job for most people, without clever timing or stock picking that a busy freelancer will not maintain.
Two Situations That Change the Answer
A day-job hybrid is common and workable. You can hold an employer 401(k) and a Solo 401(k) at the same time, funding the second from freelance income. The catch is shared: the $23,500 employee deferral limit is one limit across both plans, not a fresh allowance for each, so contributions at the day job reduce what you can defer as an employee in the solo plan. Employer-side contributions sit under separate limits, which is where the hybrid still gains real room. Track the combined deferral carefully across the year, and confirm the current year’s figures for both pieces.
Starting late changes the rate, not the verdict. At forty, the plan still works well with steady funding and the normal catch-up path as you age. At fifty, it may demand 25 to 30 percent of income and every catch-up contribution going, held for a shorter retirement runway. That is demanding math, and it still beats the alternative, which is not starting and hoping a future year feels easier. Late starters benefit most from the Solo 401(k)’s high ceiling, because the constraint is rarely willingness alone — it is how much the account will legally accept each year.
The Hiring Tripwire
One event forces a plan change no matter which door you chose. The day you take on a real employee, the Solo 401(k)’s solo rule ends and the plan has to change shape, typically toward a standard 401(k) or one of the small-team options. A SEP IRA also changes character with staff, because employer contributions must follow the plan’s rules for eligible employees, not just for you. Price that future before you hire, not after. The retirement plan is part of the true cost of the first employee, alongside payroll tax and insurance.
Recommendation
For a solo freelancer with no employees and income you expect to grow, open the Solo 401(k) and use the percentage method from the next payment onward. It shelters the most at the incomes most freelancers actually earn, it offers a Roth option in many plans, and its paperwork is a fair price for that capacity. Choose the SEP IRA instead if your income is already high enough to reach the shared ceiling either way, or if you know that filing duties and plan maintenance would push you to abandon the habit entirely — a simple plan you fund beats a powerful plan you neglect. Add a Roth IRA when cash allows, use an HSA if your health plan qualifies you, and revisit the whole setup the year you hire. The best door is the one you walk through this month, funded automatically, at a rate that rises as you do.
