Most business plans in regulated industries rest on a quiet assumption: the rules in force on the day the plan was written will still be in force when the loan comes due. Owners in cannabis, hemp, nicotine, and psychedelics know better. Rules move, sometimes in your favor and sometimes not, and rarely on a schedule anyone published in advance. The goal is not to predict every change. It is to build a financial model that expects change and tells you what to do when it comes.
Three recent reminders
- Hemp’s definition, and then its deadline. Federal law enacted in November 2025 narrowed the definition of hemp, including a total THC test and a per-container THC cap on finished products, effective one year later (P.L. 119-37, Div. B, §781; 7 U.S.C. §1639o). In September 2026, Congress pushed most of that change to December 11, 2026, while keeping November 12 for products with cannabinoids the plant does not produce naturally (P.L. 119-103; CRS IF13136). We cover the inventory side in The Hemp Cliff.
- California’s cannabis excise tax, up and back down. The rate on retail sales rose from 15 percent to 19 percent on July 1, 2025, then returned to 15 percent on October 1, 2025, after new legislation (Cal. Rev. & Tax. Code §34011.2; CDTFA). Prices and forecasts built for one rate needed updating twice in three months.
- Oregon psilocybin fees, proposed and withdrawn. The Oregon Health Authority proposed significant fee increases for psilocybin licensees in 2026, then announced on September 22, 2026 that it would not adopt them, citing feedback from its advisory board, rules advisory committees, and public comment. A separate rulemaking on unrelated program changes is planned to take effect January 15, 2027 (Oregon Health Authority).
A rule changed and then its date moved; a rate went up and back down; a proposal never became a rule. A model that hard-coded any one version would have been wrong.
Write down what your model assumes
Most models bury regulatory assumptions inside other numbers: an excise rate baked into price, a license fee folded into overhead, a product line assumed to sell forever. Pull them out where you can see them:
- Tax rates and tax base. Excise rates, who collects them, and whether §280E limits your federal deductions. For medical cannabis, that depends on Treasury and IRS guidance still to come (see Section 280E After the 2026 Partial Rescheduling).
- Product eligibility. Which products you may sell, in what form, and where. California’s retail ban on most flavored tobacco products took effect December 21, 2022 (Cal. Health & Safety Code §104559.5), and further limits and penalties followed in 2025 (California Department of Public Health).
- License and compliance costs. Fees, testing, track-and-trace, security, and the staff time compliance takes.
- Channels and geography. Where you can ship, deliver, sell, or advertise.
- Access to money. Banking, payment processing, and lending terms, which often follow regulatory status.
- Timing. When a rule takes effect and how long any transition lasts.
Whether a given rule applies to your business is a question for your attorney or regulatory counsel. Once they answer it, the financial effect belongs in the model.
Give each assumption a range and a date
For each line, record three things: the current rule, a realistic range, and the next date that could move it. For example:
- California cannabis excise tax. 15 percent as of this writing, with the next adjustment under current law no earlier than July 1, 2028 (CDTFA). The 19 percent rate the state used briefly in 2025 is a reasonable tightening case.
- Federal hemp definition. As of this writing, effective dates of November 12 and December 11, 2026, with bills pending that would delay, repeal, or replace the change (CRS IF13136). The range runs from “product line continues” to “product line stops.”
- Oregon psilocybin rules. A comment period on the next rulemaking is expected in December 2026 (Oregon Health Authority). The fee increase leaves the base case, but it can stay in the tightening case at no cost.
The date matters as much as the range. A change you can see coming is a planning problem. A change you notice after it takes effect is a cash problem.
Build three scenarios
- Base. The rules as they stand, plus changes already enacted with a date.
- Tightening. The realistic adverse version: a higher rate, a lost product line, a longer transition, a higher fee.
- Loosening. The favorable version: a lower rate, a new channel, a deduction restored. Good news needs a plan too, because it can bring new competitors, price pressure, and a tax position that needs updating.
Keep these realistic rather than catastrophic. The aim is to plan across the range you can reasonably see. Extreme shocks deserve their own exercise, which we walk through in The Regulated Business Stress Test. A financial model with switchable assumptions keeps all three in one place.
Measure runway and covenant headroom
For each scenario, look at two numbers before profit: months of cash on hand, and the distance to any loan covenant, such as a minimum cash balance or a debt service coverage ratio. A business can survive a rule change on cash and still breach a covenant first.
A hypothetical example, in round numbers:
- Starting point. $300,000 in cash, with a lender requiring at least $150,000 at all times.
- Base case. The business adds $20,000 a month.
- Tightening case. A product line contributing $60,000 a month in gross margin stops for six months while it is reworked, so the business loses $40,000 a month.
- Runway. $300,000 divided by $40,000 is 7.5 months, longer than the six-month gap.
- Covenant. The $150,000 cushion above the minimum lasts 3.75 months, so the breach comes in month four.
- Gap to close. Six months at $40,000 is $240,000, leaving $60,000, which is $90,000 below the covenant.
“We survive” is not the useful answer. “We need $90,000 more, or cuts worth $15,000 a month” is. The cash flow calculator can help you sketch a month-by-month outlook for each scenario.
Decide your triggers in advance
Pre-decide what you will do at each stage, while the month is calm:
- Proposed. A bill is introduced or a rule is proposed. Run the tightening scenario and slow purchases of affected inventory.
- Likely. A bill passes one chamber, a comment period closes, or a date is set. Pause new commitments tied to the affected line and talk with your lender early.
- Confirmed. The law is enacted or the rule is adopted. Carry out the plan: reprice, rework, shift channels, or exit the line.
- Withdrawn or delayed. Release part of the reserve, update the date to watch, and keep the scenario on file.
Build room into contracts and cash
- Contracts. Long minimum purchase commitments, fixed pricing, and leases without exit options can lock a business into yesterday’s rules. Ask your attorney how termination rights, minimum purchase terms, and pricing or change-in-law provisions work in your current and future agreements. Your model can show what each provision is worth in each scenario; counsel decides how to draft it.
- Reserves. Hold cash sized to the tightening scenario’s gap, about $90,000 in the example above, and write down what releases it. A reserve with a named purpose is easier to defend and easier to keep.
Make it a quarterly habit
Regulatory assumptions go stale quietly. Once a quarter:
- Update each assumption’s status and next date
- Re-run all three scenarios with actual results
- Check runway and covenant headroom against your triggers
- Retire assumptions that no longer apply and add new ones
Done alongside a quarterly close, it turns rule changes into scheduled decisions instead of surprises.
How TreeStar can help
The TreeStar team can help you turn regulatory assumptions into a working plan: financial modeling and cash flow forecasting with base, tightening, and loosening scenarios; bookkeeping and inventory accounting that keep the actuals current; and tax preparation and planning, including §280E for cannabis. We work alongside your attorney or regulatory counsel, who handle the legal questions, and focus on what each change does to your numbers, your cash, and your plan. Learn more about our work with regulated product businesses.
This article is general information, not advice for your situation. Rules change; confirm current law before acting.
