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Continuing Our Partnership with Opolis for the 2025 Tax Season
As we enter our third year of partnership with Opolis, we're delighted to offer Coop members preferred pricing on S Corporation tax preparation and filing. Plus, enjoy a 10% discount on our range of services with Referral Code: OPTR25
S Corp Tax Returns
If you’re an S Corporation, it’s important to note that your income tax returns are due by March 15th of each year (September 15th with extension). Our team can assist you with preparing and filing Form 1120-S, related state filings, and even help you make the S Corp election if you missed the deadline. Don’t stress about tax season – let us handle the details for you.
This includes:
- Preparation of Form 1120-S, K-1, and related state returns
- Electronic federal filing with the IRS
- Electronic state filing where applicable
Federal Filing Only*
$750
We help crypto-native teams bridge on-chain activity with traditional financial workflows. From wallets and validators to bridges and staking platforms, we track and reconcile activity across ecosystems. Our team delivers GAAP-aligned ledgers, dashboards, and reports that power treasury management, tax compliance, and investor reporting—purpose-built for hybrid crypto/fiat operations.
Federal Filing + 1 State*
$1,000
We file corporate tax returns for blockchain-native orgs across entity types, from US-based C-Corps to DAO-run LLCs. We help manage international disclosures, quarterly filings, and past-due cleanup. When needed, our tax team will represent you with the IRS directly to resolve notices or negotiate payment plans.
Federal + State + Passthrough Entity Tax*
$1,250
We support your org’s strategic roadmap with advisory around tax structure, capital planning, and growth. Whether you're merging, raising, tokenizing, or selling — we’ll map it out with entity modeling, exit-readiness audits, and tax mitigation. We also help teams set KPIs and model budgets across crypto treasuries and fiat ops.
* Cryptocurrency tax reporting, financial statements (P&L / Balance Sheet) not included. View our Individual & Entities Services pages for more details.
Interested in more than S Corp filing? Use referral code OPTR25 for 10% off additional services.
How It Works
Book a free consultation
You’ll be asked a few questions to help us structure our working relationship.
Provide Referral Code
Use referral code OPTR25 to unlock your discounted pricing.
Let the journey begin
You’ll choose how we move forward with the services you need to get settled.
Tailored Financial Solutions for Opolis Members since 2023
Why work with us
Since 2023, Darien Advisors has been a pivotal partner to Opolis, offering not just specialized S-Corp filing services but also extending our expertise in areas like Crypto tax reconciliation and accounting/bookkeeping. Our collaboration has empowered hundreds of Opolis members, showcasing our versatility and commitment to addressing a wide range of financial needs.
Schedule a free consultationCustomized S-Corp Filing
We provide personalized S-Corp filing services, understanding each Opolis member’s unique financial situation.
Deep Crypto Expertise
We don’t just work in crypto—we live it. Our team has deep, hands-on experience across DeFi, DAOs, NFTs, validators, and on-chain accounting.
Predictable Pricing, No Surprise Bills
No hourly rates. No hidden fees. Fixed-fee engagements and subscription plans so you always know what to expect.
Beyond Tax Filing, but also Accounting/Bookkeeping:
Beyond tax services, we offer thorough accounting and bookkeeping support, helping Opolis members maintain financial clarity and control.
A Growing, Evolving Partnership
As we continue our journey with Opolis into our second year, our partnership strengthens, reflecting our shared dedication to the success of independent professionals.
Frequently Asked Questions
This includes tax preparation and compliance for your S Corporation. It assumes you will provide us with financial statements and applicable cryptocurrency gain/loss/income reports to include in the return. It does not include any advisory or tax planning work, but we're happy to address tax questions via email, Discord, and our client portal.
The prices above cover S Corporation tax preparation and filing only and are based on time, effort, our third-party service provider costs, and the group discount worked out with Opolis.
We offer flat rates for S Corp prep and filing and a 10% discount to every Opolis member on all other services. You will need to input the referral code in the form when you book a call or make sure to let us know on the call (if you forget to add during booking). Referral Code: OPTR25
We handle all our communication through our dedicated portal, Karbon, or via email to ensure streamlined and efficient interactions with our clients.