One smart legal move is to reinvest part of the $600k revenue into deductible business expenses—for example equipment, marketing, employee benefits, or software—so your taxable profit drops while still growing the business. Another strategy is contributing profits to tax-advantaged retirement accounts (like a SEP-IRA or Solo 401(k)), which can defer tens of thousands of dollars in taxes while building long-term wealth. For your LLC transition, consider electing S-corp status once your income exceeds a certain threshold, as this can save significantly on self-employment taxes.