Zero-based budgeting

Few finance ideas arrive with as much shine as zero-based budgeting. It promises something that sounds unarguable: stop rolling last year’s numbers forward by a few percent, start every budget from a blank page, and make every cost earn its place. Put like that, who could be against it? And yet for fifty years ZBB has followed the same arc: rediscovered, evangelised, rolled out at enormous effort, and then quietly abandoned a year or two later. That pattern is the most interesting thing about it, and the part the brochures leave out.

This is the honest version. We’ll define what ZBB actually is, trace why it was invented and what problem it was genuinely solving, look at the cases where it earns its keep, and the ones where it quietly destroys value, and lay out the pitfalls that sink most implementations. The aim isn’t to sell it or bury it. It’s to leave you able to tell, for your own organisation, whether it’s the right tool or just the fashionable one.

What zero-based budgeting actually is

Zero-based budgeting is a method in which every budget is rebuilt from a base of zero each cycle. No line is carried forward by default; every expense must be justified from scratch, as if the activity were being funded for the first time.

The contrast that defines it is with the thing almost everyone actually does: incremental budgeting. In the incremental world, last year’s budget is the starting point. You take the prior number, adjust for inflation, growth, a known new hire or two, and the bulk of the budget is settled before anyone has asked whether the underlying spend still makes sense. The default is continuation. You argue about the change, not the base.

ZBB inverts that default. There is no base. The marketing team doesn’t start from “last year plus 4%”. It starts from nothing and has to build the case for every programme it wants funded. The question stops being “how much more than last year?” and becomes “does this spend deserve to exist at all, and at what level?”

The mechanism that makes this tractable is the decision package. Rather than budgeting line by line in the abstract, managers describe each activity as a self-contained unit: what it’s for, what it costs, what it delivers, and, crucially, what happens at different funding levels. A decision package for a support function might describe the minimum viable version, the current version, and an enhanced version, each with its own cost and consequence. Leadership then ranks the packages across the whole organisation and funds down the list until the money runs out. Spending stops being a set of departmental entitlements and becomes a single prioritised queue.

ZBB forces every activity in the company to compete for the same pool of money, on stated merits, rather than each defending its own historical slice.

That ranking step is the real heart of it. ZBB isn’t only about scrutiny. It’s about making spend earn its place against every other claim on the budget, not just against its own past.

Why it was invented

ZBB was a solution to a specific, real, and still-familiar disease: budgetary slack.

When every budget starts from last year’s, costs become sticky in a particular way. A programme funded for a good reason in 2019 keeps getting funded in 2024, not because anyone re-decided it was worthwhile, but because it was in the base, and the base is what nobody argues about. Low-priority activities survive indefinitely simply by never being re-examined. Inefficiency compounds quietly, one untouched line at a time. The incremental process is structurally biased toward yesterday’s priorities, because it only ever debates the increment.

The man who named the cure was Peter Pyhrr, a manager at Texas Instruments. In the late 1960s he built a process to make every activity justify itself from zero, and ran it across the company’s staff and research divisions to prove it could work at scale. In 1970 he wrote it up in the Harvard Business Review, and the idea escaped into the world.

It escaped fast. Jimmy Carter, then Governor of Georgia, read the article and put ZBB to work in the state’s government; when he reached the White House later in the decade he pushed it onto the federal budget. For a while in the 1970s, zero-based budgeting was the reform: the technique that would finally drag public spending back to first principles.

The problem ZBB was built for is real and hasn’t gone anywhere: budgets that carry yesterday’s decisions forward unexamined, because the base is the one thing the process never questions. Every revival of ZBB is really a rediscovery of that problem.

Hold onto that, because it matters for the honest assessment. The disease is genuine. The question is only whether this particular cure is worth its side effects, and whether you have to take the full dose to get the benefit.

The second life, and the cautionary tale

ZBB never fully died, but it came roaring back in the 2010s, this time wearing a sharp suit. Its champion was 3G Capital, the Brazilian investment firm, which made relentless zero-based cost discipline the centrepiece of how it ran the consumer-goods businesses it acquired. ZBB became a consulting product: packaged, sold, and rolled out as a transformation programme. This is the “consulting gloss” the title means: ZBB repositioned from a budgeting technique into a promise of permanent, dramatic cost reduction.

The most-studied result is Kraft Heinz, formed by a 3G-backed merger in 2015. The cost machine worked exactly as advertised at first. Margins jumped, costs fell. And then the bill came due. Marketing spend was squeezed to roughly half the level of peers. Brand-building, research, and innovation (the things that don’t show a return this quarter) were starved. Package sizes shrank. And a few years on, in early 2019, the company took a $15.4 billion writedown against the value of its best-known brands and watched its market value fall by more than half.

The lesson isn’t that ZBB is a fraud. It’s narrower and more useful: a method built to question every cost is dangerous in the hands of people who only want the costs to go down. Cutting and prioritising are not the same act. ZBB is a prioritisation discipline that can be used to cut, but pointed at a brand-driven business with a mandate to reduce spend every year, it will happily eat the seed corn.

You can’t cut costs forever. There’s a floor, and ZBB will find it whether or not the floor is where value lives.

So the honest reading has two halves. ZBB is a legitimate, sometimes powerful way to reallocate money toward what matters. It is also the favourite instrument of value-destroying cost crusades. Which one you get depends entirely on the intent behind it, and that’s a management choice, not a property of the method.

When it actually fits

ZBB is a heavy instrument. Used everywhere, all the time, it collapses under its own administrative weight. Used in the right place, at the right moment, it does something no incremental process can. The skill is knowing which situation you’re in.

A useful reframing the better practitioners have landed on: ZBB is less an annual budgeting system than a periodic cost-structure reset, a way to rebuild your understanding of where the money goes and force a re-prioritisation, after which lighter-weight processes keep it honest.

What it gives you, and what it costs

Strip away the advocacy and the criticism, and the trade is fairly clear.

Notice the symmetry: almost every benefit has a shadow. Visibility costs effort. The slack reset risks cutting muscle with the fat. The accountability breeds friction. ZBB doesn’t have a free lunch hidden in it. It has a real trade, and the trade is only worth making when the slack is genuinely there and the intent is genuinely reallocation.

The pitfalls that matter most

If you take one thing from the practitioner literature, take this: most ZBB programmes don’t fail at the analysis. They fail at the follow-through and the framing. Four pitfalls account for most of the wreckage.

The pattern under all four: ZBB is easy to start and hard to sustain. The analysis is the glamorous part and the easy part. The framing, the tooling, the defence of the long term, and the discipline to keep doing it: that’s where the value is won or lost.

The honest assessment

So, after the gloss wears off, is zero-based budgeting good?

The honest answer is that it’s a sharp, narrow tool wearing the costume of a universal philosophy, and most of the disappointment comes from confusing the two.

As a tool, it’s real. The problem it attacks, slack accumulating in an unexamined base, is genuine and widespread, and nothing in incremental budgeting will surface it. Pointed at the right spend, with reallocation as the goal and the stamina to make it stick, ZBB does something valuable that the alternatives don’t: it makes every cost compete on present merit, and it moves money toward what matters.

As a philosophy (rebuild everything from zero, every year, forever) it overreaches, and the overreach is where it hurts people. The full ceremony is too expensive to run universally, the short-term frame quietly punishes the investments that build the future, and the same machinery that reallocates wisely in good hands cuts to the bone in cost-obsessed ones. The most famous ZBB story of the last decade is a cautionary one for a reason.

The synthesis the better practitioners have reached is the sane one: use ZBB as a periodic reset, on targeted spend, with a deliberate guard for the long term, not as a permanent annual ritual applied to the whole business. Get the base honest, reallocate toward priorities, then let lighter processes hold the line until the next reset. Treated that way, it’s one of the more powerful instruments in the budgeting toolkit. Treated as a religion, it’s the most expensive way ever devised to talk yourself into eating your own seed corn.

The technique isn’t the risk. The intent behind it is.

In Novi, the base is never a mystery

Most of what makes ZBB painful isn’t the idea. It’s the labour and the blindness. The exercise demands that you see every cost at line-item granularity, sliced by category and by owner, re-rankable across the whole organisation, with funding tiers you can flex and compare. On a patchwork of spreadsheets, assembling that view is the project, and by the time it’s assembled, it’s already stale.

In Novi, the cost structure is a model, not a reconstruction. Spend lives in dimensioned tables (by cost category, by owner, by activity) so the granular, multi-dimensional view ZBB requires isn’t built from scratch each cycle; it’s the shape of the data already. Slicing overhead by department, then re-slicing the same money by category, is a pivot, not a rebuild. The decision-package idea (minimum, current, enhanced) is just a scenario dimension: model the funding levels side by side, rank them, and watch the totals move as you fund down the list.

And because the base is structured and legible, the two things that sink ZBB programmes get easier. The tooling pitfall softens. You’re not waiting a quarter to learn whether units hit their targets, because the numbers are live in the model. And the short-term blindness gets a counterweight: when strategic spend is its own first-class dimension, it’s something you can ring-fence and look at deliberately, not a line that silently loses the argument because nobody could see it whole.

Novi won’t tell you whether to run ZBB. That’s a judgement about your business, and this article has tried to make it an honest one. What it removes is the excuse that the exercise is too heavy to attempt, and the trap that you cut blind. The discipline becomes about the decisions, where it belongs, not about the assembling of the spreadsheet underneath them.