Sure, that's a pretty dang good idea. I.e., set up LLC in Washington state today.. and then if you see your income spike up a bit more, elect S status.
BTW, all this also depends on your specific situation. E.g., say you pay $7K in health insurance... and do $3K to an HSA... and want to save $9K to a SEP...
In this situation--just as an example--you might be able to make an S corporation work. You would pay Gunderson the employee $26K in wages... that's low but the health insurance and HSA can count as wages too except they aren't subject to payroll taxes... so you're only paying FICA on the $26K and the W-2 shows $36K...
With $36K in wages, you can do a 25% match so that's another $9K... now Gunderson the employee's "compensation" is up to $45K basically but he's only paid payroll taxes on $26K.
If Gunderson the shareholder gets another $5K or $10K of shareholder profit, that's not subject to payroll taxes and probably not interesting to the IRS.
In example like above, an S corp might work.