On the surface, the NAB had a tough year: a 42.9% fall in annual profit after bad debt charges blew out in the recession Australia forgot to have. However, that was a picture further from rude health of the NAB’s report.

It was a high-class result and with the bank increasing its Australian interest margin in the year, you have to wonder how it can justify lifting fixed home-loan rates, which it has done in the past week or so.

And with such a strong result under its belt, you would have thought the bank might have had the grace to mention the help from the federal government and Reserve Bank during the year, especially in the first half in stabilising the banking system and boosting confidence (and providing cash to keep the banks going).

But not a word from the NAB today about that: it was all down to the efforts of the new management team and the foot soldiers in the branches. Far from it. If it hadn’t been for the Commonwealth’s lending the banks Australia’s Triple A rating (for a fee) and the RBA lending the banks $45 billion via repurchases of self-securitised home loans in the final quarter of 2008, the NAB and its fellow banks might have had a far different set of figures to set before shareholders.

So do you believe that the NAB’s net profit was $2.589 billion for the 12 months ended September, down from $4.536 billion in the previous year, as the bank said today? Dividend was chopped 24.7% with two payments of 73 cents a share (interim and final), making $1.46 for the year as a whole (down from $1.94 a share). Shareholders paid a price as well.

Some early reports suggested the bank had a bad year. It did in one respect because many of the bad debts, actual and prospective, were due to dud lending practices to the big end of town, Allco Financial, ABC Learning and the like. So the bank stuffed its bad and doubtful debts full of extra cash (which helped with the impression of a tough year). Bad home loans were not an issue.

The bank’s band and doubtful debt charge for the year was $3.8 billion, up $2.3 billion after excluding conduit costs (conduit costs were those funny money securities the bank had parked off balance sheet and that imploded during the slump from late 2007 through to earlier this year. The value is now rising).

But a look at the nitty gritty of the NAB’s results shows a very different story: one of an immensely strong and resilient organisation that is now one of the Big Four cartel dominating the Australian economy in a way we have never seen before.

Take revenue, up just under 10% in a year (to $16.9 billion) that was allegedly “tough”. Having reported and observed the terrible slump of the early 1990s (which the NAB rode out), the past two years, while terrifying in parts, have ended up helping the banks and being very, very kind to them.

Cash earnings fell 1.9% (hardly a blink when we are talking billions of dollars) to $3.841 billion in the year to September, from $3.916 billion.

Cash earnings omit unrealised gains or losses related to asset values; while so-called underlying profit, which excludes expenses and bad and doubtful debt charges, was $9.3 billion, up 14.6%, which is a very, very good year for any company, let alone one in a year that the Australian economy has just been through.

Net interest margin in Australia, the bank’s profit heartland, rose from 2.42 cents in the dollar to 2.59 cents (it was as high as 2.65c at the March 30 halfway point). The rise in the net interest margin was not played up at all in the media statements: it was buried in the detail in the report to the ASX

The bank lifted revenue 9.7%, costs went up 2.9%. The overall cost to income ratio fell to 43.9 cents in the dollar from 46.9c. In Australia it was even lower, about 38.8c in the dollar. This is a lean, mean money machine. When the bad debts stop growing, as they will this half, the NAB will start coining cash like it has not done before.

But nowhere was the true state of the strength of the NAB evident than in its Australian banking business, from where the it gets most of its earnings (59% to be precise)

“Cash earnings fell by 5.3% to $2.8 billion in 2009 while underlying profit was up 16.1% to $5.5 billion. The underlying profit growth stemmed from robust revenue growth and continued careful cost control,” the bank said in the statement.

“Net interest income increased by $1.1 billion or 17.3% on the basis of good volume growth and active repricing for current risk settings.”

(That’s not a sign of a bank doing it tough and finding it harder to make a living from narrowing interest margins, as it claimed during the year to justify not handing on all the RBA’s rate cuts).

“Average interest earning assets grew by $24.3 billion or 9.5% with growth in business lending the most significant contributor. Average retail deposits increased 18.6% to $127.3 billion, growing market share by 1.7 times system growth.”

That itself is interesting: RBA figures for business lending show a fall of 2.2% in the 12 months to August, which means the NAB had grabbed a lot of business  from other lenders, and this at a time when the NAB and other banks were monstering clients large and small to refinance via share issues and higher-priced small loans.

“During the year, business deposit market share increased by 1.6% to 24.0% and business lending market share increased by 1.4% to 20.1%.”

So the reality is that in its core banking division, costs fell, revenue rose, underlying profit rose steeply and the bank had bigger deposits at a rate faster than the growth of deposits overall through the banking system, and its business lending soared to where it had a share of  one in five of every dollar leant to business, was made by the NAB.

Tough year indeed.