Does QuickBooks track burn rate for startups?

QuickBooks generates cash flow statements and P&L reports that show your net cash outflow - the raw material for burn rate. But it doesn't calculate burn rate, project runway, or model forward scenarios. You'd need to export the actuals and build the projection logic yourself, typically in a spreadsheet. For a seed-stage company raising on a 12-18 month runway story, QuickBooks alone isn't enough for investor-facing reporting.

What's the difference between burn rate and runway, and which tools calculate each?

**Burn rate** is your net monthly cash outflow - gross burn (total spend) minus revenue. **Runway** is how many months of cash remain at the current burn rate, or projected rate under a growth model. Tools like Mercury and Ramp calculate a trailing burn rate automatically from your bank balance history, but use flat-rate assumptions. Runway (the FP&A tool) and a well-built Google Sheets model can both calculate runway under varying growth and hiring scenarios - which is what investors actually want to see.

Is Mercury or Ramp good enough to replace a financial model for a board deck?

No. Mercury shows a trailing burn rate based on average monthly outflows and projects it forward at a flat rate. That works for a gut check but breaks down when your burn is changing - which it always is at seed stage. A board deck needs runway projections under at least 2-3 scenarios (base case, conservative hire, accelerated growth), with assumptions separated from outputs. That requires a model, not a dashboard.

How much does startup accounting software cost in 2026?

QuickBooks Online runs $35/month (Simple Start) to $235/month (Advanced). Xero is $15-78/month depending on tier. Both cover the basics for a seed-stage startup. If you add a bookkeeping service like Pilot on top, that starts at $499/month. For the modeling layer, Runway is ~$149/month for early-stage companies and Causal runs ~$50/month. Most seed-stage founders do fine with a $35-78/month accounting tool plus a free Sheets model.

When should a startup invest in a dedicated FP&A tool like Runway or Mosaic?

Mosaic is priced for Series B and later - it typically doesn't make sense below $2-3M ARR. Runway is worth evaluating once you're spending significant time (3+ hours/month) maintaining a manual Sheets model and you have multiple revenue streams, headcount scenarios, and a board that meets quarterly. At seed with fewer than 50 paying logos and a single pricing tier, a well-structured Sheets model is faster to build and easier to explain in due diligence than any purpose-built tool.

Best Accounting Software for Startups: Burn Rate & Runway 2026

Here's what works at seed and Series A in 2026, and where each tool breaks down.

What "Tracking Burn Rate" Actually Requires

Accounting software records what happened. Runway modeling answers what happens next.

QuickBooks tells you your net cash outflow last month was $47k. That's accounting. But your investor wants to see: if you close 3 logos at $800 MRR each over the next 60 days and hire a backend engineer in September, does the $340k in the bank last to Series A? That's a model, and no accounting software ships that.

The distinction matters because founders spend time searching for tools that "track burn rate" expecting a dashboard to replace a model. They don't. They surface the inputs. You still have to build the logic.

The Tools, Evaluated

Tool	Best For	Burn Rate Tracking	Runway Projection	Price (2026)
QuickBooks Online	Bookkeeping, taxes	P&L-based reports	None	$35-235/mo
Xero	Bookkeeping, UK/AUS	Cash flow statement	None	$15-78/mo
Mercury	Startup banking	Live balance + spend rate	Rough estimate	Free (banking)
Ramp	Spend management	Departmental burn	None	Free-$15/user
Brex	Spend + corporate card	Real-time spend	None	Free basic
Pilot	Full-service bookkeeping	Dashboard with burn	Manual	$499+/mo
Runway	FP&A modeling	Actuals + projections	Full scenarios	~$149/mo
Causal	Financial modeling	Formula-based	Driver-based	~$50/mo
Google Sheets	Everything	Whatever you build	Whatever you build	Free

Accounting Layer: QuickBooks vs. Xero

If you need accrual accounting, clean books for a fundraise audit, and something that doesn't embarrass you during due diligence, pick one of these two. That's basically the only decision.

QuickBooks Online is the default for US-based startups. At $35/month (Simple Start) you get basic P&L and cash flow. At $85/month (Plus) you get project tracking and class-based reporting - useful if you're allocating burn across cost centers. The burn rate "report" in QBO is just a cash flow statement filtered by date. Serviceable. Not investor-ready without reformatting.

Xero runs $15-78/month and wins on cleaner UI and better bank reconciliation. If your bookkeeper is outside the US, they probably prefer Xero. The financial reporting is slightly more flexible than QBO but the same limitation applies: it surfaces actuals, not projections.

Neither tool will tell you your runway. Both will give you the actuals you need to feed a model.

Spend Visibility: Mercury, Ramp, Brex

These are better for real-time burn awareness, worse for investor-grade projections.

Mercury is the de facto startup bank as of 2026. Its dashboard shows a rolling burn rate based on your checking/savings balance history - typically a 90-day trailing average. It's good enough for a quick gut check. It's not a replacement for a model. The runway estimate Mercury shows assumes flat burn, which is almost never true when you're actively hiring or running paid acquisition.

Ramp gives you real-time departmental spend and shows burn by category. If you're running $40k+/month in expenses and need to see which team is eating budget, Ramp earns its place. The runway feature is thin - it takes your current balance and divides by average monthly spend. That's arithmetic, not modeling.

Brex is similar to Ramp for spend management. The financial insights dashboard is slightly more polished but carries the same limitation.

Use one of these for spend control. Don't confuse their dashboards with financial models.

Dedicated Modeling Tools: Runway, Causal, Pry

These are the tools built to actually answer the runway question.

Runway (the tool, confusingly named) is probably the best purpose-built startup FP&A tool available in 2026. At around $149/month for early-stage, it connects to QuickBooks, Xero, and Mercury, pulls actuals automatically, and lets you build scenario models with driver-based assumptions. The output is genuinely close to investor-ready. The limitation: it's another tool to learn, it abstracts away the underlying logic in ways that can make investor Q&A harder ("I don't know exactly how it calculated that"), and it doesn't handle cap table dilution or token-based pricing models well.

Causal is more flexible - closer to a spreadsheet than a purpose-built financial tool. You build models with variables and formulas, and it handles scenarios cleanly. At ~$50/month it's a reasonable middle ground. The tradeoff is it takes longer to set up than Runway and requires more modeling knowledge upfront.

Pry was acquired by Brex and integrated into their platform. If you're already using Brex, worth exploring. As a standalone it's less compelling than Runway.

Here's the honest take on all three: they're good until your model needs to do something custom. The moment you're modeling token-based SaaS pricing, a SAFE stack with multiple discounts, or cohorted CAC payback under two different hiring plans, you're working around their assumptions. Every founder I've talked to ends up with at least one critical tab in Sheets anyway.

The Spreadsheet Argument

Most seed-stage founders with $8-50k MRR don't need a dedicated FP&A tool. They need:

QuickBooks or Xero pulling clean actuals ($35-78/month)
A runway model in Google Sheets that connects to those actuals

The Sheets model wins because it does exactly what you tell it to. You can model 30 paying logos at $280 ARPU, 4% monthly logo churn, a $180k engineering hire in month 3, and a Series A raise at month 8 - all with assumptions on a separate tab, outputs that tie, and a sensitivity table showing runway under three revenue scenarios. That's the model that holds up in a board meeting.

The problem with Sheets has always been maintenance. Pulling actuals from QuickBooks into your runway model is manual work - export, reformat, paste, recheck. If it takes 45 minutes every month to update the model, founders stop updating it, and then the deck has stale numbers.

ModelMonkey solves exactly this. It lives inside Google Sheets and pulls live data from connected sources - including accounting tools - so your burn rate and runway numbers update without the manual pipeline. The model stays current, which means it actually gets used.