Louis T. Wierenga — Tax Attorney and Principal, Wierenga.Tax, Arlington Heights, Illinois

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Strategic Tax Planning for High-Net-Worth Individuals, Family Offices, and Closely Held Businesses.

Wierenga.Tax is a boutique tax law and advisory firm in Arlington Heights, Illinois. We work year-round with high earners and their advisors to legally minimise tax liability, plan estates, and represent clients in audits — under one roof, with tax attorneys, CPAs, and estate planners in-house.

We work with high-net-worth individuals, family offices, and closely held businesses with $2M+ in annual income or revenue.

Book a Consultation Or call (847) 749-1131

EST. 2008

Founded by Tax Attorney Louis T. Wierenga, JD

JD · CPA · EA

Tax attorneys, CPAs, and Enrolled Agents under one roof

RIA-FORWARD

Trusted by Registered Investment Advisors and their HNW clients

ARLINGTON HEIGHTS, IL

Chicago-area boutique. National client base.

Who We Work With

If any of these sound familiar, we should talk.

You're earning $2M+ a year and your current CPA only contacts you at filing season — no proactive planning, no strategy, no forecasting.
You've been told the standard moves (S Corp election, 401(k), HSA) but you know there's a deeper layer of planning the right advisory firm would walk you through.
You're an RIA or wealth advisor with HNW clients who need a tax partner who actually understands portfolio implications, not a generic preparer.
You run a closely held business doing $2M+ in revenue and your entity structure has not been reviewed in years — you suspect it's costing you.
You've received an IRS or state agency notice and you need actual legal representation in-house, not a CPA reading from a script.

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Practice Areas

One firm. Five practices.

Year-round advisory under one roof. No handoffs. No referrals out. Every conversation stays in-house with the same team that built your plan.

Strategic Tax Planning

Proactive, long-term frameworks built to legally minimise tax liability before the year ends — not after. Year-round modelling for high earners, business owners, and family offices.

Tax Preparation

Comprehensive individual and corporate filing, with a specialised focus on clients of Registered Investment Advisors and wealth advisors. Coordinated directly with your portfolio team.

Tax Audit Representation

Legal counsel and negotiation strategy handled in-house by our tax attorneys when facing IRS or state agency audits. Full representation, not referral-out.

Estate Planning

Wills, trusts, powers of attorney, living wills, and probate administration. Drafted and reviewed by our in-house legal team, integrated with your tax plan.

Small Business Support

Customised packages handling QuickBooks Online bookkeeping, payroll processing, and industry-specific compliance for closely held businesses.

Built in 2008. Run from Arlington Heights.

Tax attorneys, CPAs, and estate planners — under one roof.

Wierenga.Tax was founded in 2008 by Louis T. Wierenga, a Valparaiso Law-trained tax attorney. The firm operates from Arlington Heights, Illinois, with a national client base served through a modern smartphone-friendly client dashboard. Every engagement is staffed by the practice area that fits — but coordinated by a single point of contact who knows your full picture.

What Clients Say

From the clients and advisors who trust us.

Michael, Founder · $14M B2B SaaS · Chicago

$340K in documented savings, year one.

"We'd been with a top-50 national firm for five years and never once had a proactive planning conversation. Louis's team built us a multi-year framework in the first ninety days that returned more than ten times what we paid them. Year one savings: $340,000, documented."

Catherine, Principal · Registered Investment Advisor · Naperville

The tax partner my HNW clients actually trust.

"I refer my highest-net-worth clients to Wierenga.Tax because they speak my language. Portfolio-aware. Estate-aware. They don't blow up my plans with last-minute filing decisions. They've become an extension of my practice."

David, Family Office Principal · $40M+ AUM · Chicago

Estate plan and tax strategy under one roof.

"We consolidated three relationships — tax prep, tax strategy, and estate planning — into Wierenga.Tax. The coordination alone has saved us thousands of hours and avoided the kind of mistakes that happen when three firms don't talk to each other."

Louis T. Wierenga, Principal and Founder, Wierenga.Tax

About Louis

Hi, I'm Louis.

Hi, I'm Louis T. Wierenga. I founded Wierenga.Tax in 2008 after training as a tax attorney at Valparaiso University School of Law. I built the firm because I'd seen too many high earners in the Chicago region — business owners, RIA clients, family offices — relying on year-end tax preparation when what they actually needed was year-round strategy.

Almost every client I meet has been told by their current CPA that there's nothing more to do. Almost every time, there is. I work with my team of in-house attorneys, CPAs, and estate planners to build the multi-year frameworks that most firms in our market won't take the time to put together.

If you're earning $2M or more a year, or running a closely held business at that scale, the right conversation is a free 30-minute consultation. We'll tell you whether there's room to do more — and if there isn't, we'll tell you that too.

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Frequently Asked

Common questions before you book.

Is the consultation really free?

Yes. The first 30-minute consultation is at no cost. We use it to understand your current setup, your income or revenue scale, and whether there's room for us to help. If we're not the right fit, we'll tell you on the call.

What's the minimum income or revenue you work with?

We work with high-net-worth individuals, family offices, and closely held businesses with $2M or more in annual income or revenue. If you're below that threshold, we can recommend a firm better suited to your stage.

Do you only work with clients in the Chicago area?

No. We're based in Arlington Heights, Illinois, but we serve clients across the United States through our smartphone-friendly client dashboard. Most of our work happens remotely.

How is this different from my current CPA?

Most CPAs prepare tax returns. We prepare tax returns AND build multi-year strategy AND draft estate plans AND represent clients in audits — all in-house. One firm, one point of contact, no referral-outs.

What happens after I book the consultation?

You'll receive a calendar confirmation and a short pre-call questionnaire. On the call, we'll review your current setup, identify areas of opportunity, and outline what working together would look like. If we move forward, you'll receive a flat-fee estimate through our client portal.

Do you work with RIAs and wealth advisors?

Yes. A significant portion of our practice is partnering with Registered Investment Advisors and wealth managers who need a tax partner who understands portfolio implications. We work directly alongside your advisor team.

One firm. One call. One decision.

If you're earning $2M+ a year and you're ready for a proactive partner instead of a reactive preparer, the next step is a free 30-minute consultation.

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Or call (847) 749-1131 · info@wierenga.tax

Request your free 30-minute consultation