San Diego County

Personal Tax Preparation for San Diego County Business Owners

Individual tax returns for owners whose personal taxes are shaped by the business: K-1 income, rental property, equity, estimated payments and California rules that differ from federal.

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CPA-led team
Tax preparation and CFO planning in one place
Built for $1M to $30M companies

$1M to $30MRevenue range we focus on

Tax + CFOOne team for filing and planning

18 citiesServed across San Diego County

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Personal tax preparation for growing San Diego County companies

For most business owners, the personal tax return is where the business finally shows up on the bill. S corporation and partnership income flows through on Schedule K-1, an LLC that owns the building reports rent on Schedule E, and the California pass-through entity elective tax creates a credit that only works if the personal return claims it correctly. When the business and personal returns are prepared by different firms, those pieces are easy to miss.

Scalesight prepares personal tax returns for business owners as a support service to our business tax preparation, tax planning and fractional CFO work. That means your federal Form 1040 and California Form 540 are prepared from the same numbers as the business return, with estimated payments, owner pay and year-end moves planned together. Personal tax filing for owners is part of one plan, not a separate errand in April.

What our personal tax preparation includes

Federal Form 1040 and California Form 540 or 540NR, including part-year and nonresident returns
Schedule K-1 income from S corporations, partnerships, LLCs and trusts, with basis and at-risk tracking
Rental real estate on Schedule E, with separate federal and California depreciation where they differ
Claiming California pass-through entity elective tax credits from entities that made the election
Federal and California estimated tax calculations, including California's 30, 40, 0 and 30 percent installment schedule
Stock compensation, sales of a business interest and other capital gains, which California taxes as ordinary income
Multi-state returns for owners with income or property outside California
Responses to IRS and Franchise Tax Board notices on returns we prepare

Who this service is for

Owners of S corporations, partnerships and LLCs whose business returns we prepare or review
Business owners with rental properties, a building held in a separate LLC or other real estate
Owners preparing to sell all or part of a company
Households with income in more than one state, or who moved into or out of California
Owners who want personal tax planning tied to business decisions, not just filing

Related Scalesight services: business tax preparation, tax planning for business owners, S corp tax preparation.

Where California personal tax differs from federal

California does not follow several federal rules that matter to business owners. The state does not allow the federal qualified business income deduction under Section 199A, does not allow federal bonus depreciation on business property that flows through to you, taxes capital gains at the same rates as other income, and has a much smaller standard deduction. For 2026, the FTB's Form 540-ES instructions list a California standard deduction of $5,706 for single filers and $11,412 for joint filers, while the federal amounts under Rev. Proc. 2025-32 are $16,100 and $32,200.

Estimated payments follow a different rhythm too. California requires 30 percent of the year's estimate by April 15, 40 percent by June 15, nothing in September and the last 30 percent by January 15, while federal payments are four roughly equal installments. Owners with California AGI above $150,000 must base estimates on the lesser of 90 percent of this year's tax or 110 percent of last year's, and those with California AGI of $1,000,000 or more must use the current year. A 1 percent Behavioral Health Services Tax applies to taxable income above $1,000,000. On the federal side, the deduction for state and local taxes is limited to $40,400 for 2026 and phases down when modified AGI is above $505,000, which is why the PTE elective tax election at the business level can matter so much to the personal return.

How it works

Review
We look at last year's returns, your K-1s and anything that changed this year.
Plan
Before year end, we project the federal and California tax and set estimated payments.
Prepare
We prepare your returns once business K-1s are final, so nothing is filed twice.
File and follow up
We e-file, confirm acceptance and calendar next year's estimated payments.

Personal tax preparation across San Diego County

We provide personal tax preparation to business owners in all 18 cities in the county. Local pages:

We also serve unincorporated communities such as Fallbrook, Ramona, Lakeside, Spring Valley, Alpine and Rancho Santa Fe. See every area we serve.

More detail on this service: Personal tax filings | Tax strategy planning | Multi-state filings

Why owners choose Scalesight

Meet Brendan. He is the face of Scalesight CPA and the voice in our short videos. Every Growth Audit is CPA-led and ends with a written plan you can use with or without us.

CPA-led

Tax preparation, books and CFO work are led and reviewed by a CPA, not handed to a call center.

Built for $1M to $30M

Our process is designed for owner-led companies that have outgrown a basic tax preparer.

One team

The people who close your books also plan your taxes and prepare your returns, so nothing gets lost between firms.

Fixed scope in writing

You know what is included and what it costs before work starts.

Read client case studies

Personal Tax Preparation questions

Do you prepare personal returns for people who do not own a business?

Our personal tax preparation is designed for business owners and their households, where the personal return depends on K-1s, rentals or a sale of business interests. If your situation is a straightforward W-2 return, a lower-cost preparer is usually a better fit.

Why should the same CPA prepare my business and personal returns?

Because the numbers depend on each other. Owner salary, distributions, the PTE elective tax, depreciation and loss limits are decided at the business level and land on the personal return. One team can plan both and catch mismatches before they become notices.

When are 2026 California estimated payments due?

For calendar year 2026, the FTB schedule is April 15, June 15, September 15 (with no required payment) and January 15, 2027, at 30, 40, 0 and 30 percent of the required annual amount.

Can I file my personal return before my business K-1 is ready?

You can, but it often leads to an amended return. We usually extend the personal return when K-1s are late, pay an estimate with the extension, and file once the business numbers are final.

Do you handle part-year California residents?

Yes. If you moved into or out of California, we prepare the part-year resident return and allocate income between states, which is especially important in the year you sell a business or exercise stock options.

Talk with a CPA about personal tax preparation

Start with a free Growth Audit. We review your situation and tell you what we would change, whether or not you hire us.

Financial health review of recent statements and trends
Cash flow and profitability analysis
Review of your current tax approach
Scalability readiness scorecard
A written action plan you can use with or without us