personal finance

sabeiro

2026-05-22 Fri 00:00

Created: 2026-07-16 Thu 16:59

personal finance

Personal finance is made of incomes and expenses. Here we want to understand how can balance cost optimization vs growth.

We categorize expenses in this way:

cash
money to spend for small expenses (<50) in small shops (bakery, stores), restaurants and concerts
travel
trips, holidays
living
daily expenses (rent, commuting, bills)
income
the net yearly income (salary, freelancing, prizes)
free-time
events, concerts, music, hobbies
sport
and healthcare
savings
what remains at the end of the month

finance_trend.png

Figure 1: expense type over time

expansion vs contraction

There are as well many expense types:

fixed
I try to avoid them as much as possible, just cell phone and server
subscription
the expense you can't optimized
insurance
growing trend of buying lawyer insurances
bills
cell phone, server, electricity, gas
living
to sustain a life: rent, grocery
food
a lot to optimize here
rent
a lot to optimize
sport
a lot to optimize
transportation
when you live far from your working place
maintenance
when you have properties
car
simple cars have simple maintenance
house
in your own property you can save a lot of costs learning carpentry
expansion
the money you spend to expand yourself or to increase the value of assets
workshop
the gears you might need to save cost in maintenance work
upskilling
your experience can provide additional services and build a new career
producing
you can start producing your own services and if not for selling for reducing costs
investments
money you park for multiple years to add some interests on your earnings
passive
long range investment, you occasionally re-balance 2/3 times a year
active
you frequently control your positions on the stock market

finance_year.png

Figure 2: incomplete data mid17/mid18

products

It's hard to keep track of the value of our skills, gears and assets. We decide to up-skill, buy assets and spend time investing in learning capabilities which can increase our wealth or reach. Most of those decisions are gut feeling and it's hard to track what really contributed to our overall improvement. The goal is challenging but it doesn't mean it's not worth trying it.

To help understanding personal finances a couple of products could be developed.

asset management
an app making pictures of a gear, writing the description, checking the price online, sending an alert when it is convenient to buy
asset optimization
life time and usage of an object
asset return
the share of lifetime per project and estimated return
project cost
estimated cost of each project and overall value
market benchmark
what would be the cost for a professional service and the value gap

finance_group.png

Figure 3: yearly expense per good

savings

Differentiate your savings

emergency
liquid money you can use for emergencies (repair, help…)
passive investment
money you shouldn't touch for a long time (pension, kids)
active investment
require dedicated education and time

finance_project.png

Figure 4: some hobbies are pretty expensive

year by year

Every year conditions might change: job, housing, emergencies and our personal finance should adapt to it. Changes:

job
some industries are really precarious, it's hard to keep working in IT for more than 2y for example. Salaries can change and some unemployment time comes along
productivity loss
health issues
emergencies
sometimes the focus gets shifted pretty quickly
catastrophe
earthquake was a reality for us, weather will become more and more relevant
health issues
among family members
expansion
I want to invest in assets, hobbies or education
exploit
I want to use part of my savings for my personal growth

finance_expense_year.png

Figure 5: expense distribution per year

growth

Growth is an important part of our life, we want to be wise with expenses but that shouldn't compromise our personal life. Here we see what we pay but it's not possible to clearly quantify the return. It is important that everyone understands the importance of each point

friends and family
are important and we don't need to discuss how important is to be generous but even if one thinks to save money being cautious with gifts and time the expenses definitely balance out.
lifestyle
that's the biggest trap, thinking we need to dramatically change our lifestyle as we earn more. That's a big fault which consumes most of our savings. Flat, cars, restaurants and events are the most relevant examples
travel
get into the life of different cultures and way of living, change your way of thinking. This shouldn't be just visiting touristic places
education
a good balance between skills you gain and the usage you do of that skills. Often it's hard to monetize
languages
in some cases they open you a career, understand the clients in the local language is a plus. In many other cases either the earned level is not sufficient or your company doesn't value it
culture
understand each specific feature of a culture, in some cases you are compatible, in others not. This is a plus for negotiation
skills
nowadays it is hard to learn a skill and capitalize it straight away. Competition is tough and the level is high. You need to come to a specific niche where your quality/price/customization comes to the right point
assets
the gears you need to grow an activity or learn new skills
hardware
I invested a lot in hardware to eventually save cost in maintenance
wood
the cost is increasing a lot, being able to work on wood can save a lot of money. Being able to work on it in the forest can save you a lot of logistic costs
metal
many constructions can be done with scrape metal, welding is pretty cheap
carpentry
that saves a lot of costs
hobbies
they might start with a simple time filler but can become source of income
music
it's really hard to make serious income with it but why not keep trying?
acting
super important for professional life
tailoring
textile is pretty expensive but can be a source of income
nightlife
depends a lot on your type of friends, mine definitely are owls. Cutting expenses to meet friends, going to their concerts or their events is not an option for my taste

finance_density.png

Figure 6: expense density

finance_focus.png

Figure 7: relative expense evolution

travel

Of course cutting on travel is an obvious choice for improving personal finances but if travel is a life experience the money spent is worth it. Spending the money wisely while traveling is important but sometimes difficult. The most flexibility comes from accommodation where you have more room to save

business trips
mostly refunded
trips
one shot movements for visiting family or friends
holidays
trying to select meaningful destinations and make the travel as an experience rather than a tick box list

finance_travel.png

Figure 8: travel destinations are something to consider wisely

transportation

When you live far from your working place

bike
my favorite, best deal and good for health (hearth, eyes, lungs). I count 300km/month
public
in few cities worth the money, mostly less efficient than a bike
car
in some places the only option, you can optimize a lot
renting
works in city centers, on demand cost. Some companies provide you the car as less taxed compensation
owning
I want to bet on cars that can last at least 20k km and 20y lifespan

finance_class.png

Figure 9: overall expenses over time

living

Living costs can be highly tweaked

rent
monthly cost for a flat/room/house
grocery
supermarket
cloth
cloths
transportation
bike is the best choice
gift
some gifts
bill
recurrent expenses
cell phone
hard to cut but every optimization count
internet
my demand lowers overtime and can be optimized
gas
I recently opted to buy bottles so I control when I buy it
electricity
there are many cases where you can produce part of your needs
server
I still have hosted services and domains to pay
subscriptions
none in my case, they are the hardest to optimize
fines
sometimes they come
theft
at least 4 in my case with significant losses

finance_rent.png

Figure 10: rent paid since 2002

income

Without income no optimization is possible. Earning more or increase sources of income helps of course a lot. Capitalize the savings is something we can add on top

salary
from a company
service
from a client
prize
funds
fines
to detract
lawyer
to detract
tax
to detract
investment
earnings
bank
commissions

finance_salary.png

Figure 11: salary since 1997

free-time

Free time is a big part of our personal growth. It impacts our well-being and increase our chances as well to be overall more proficient in life

book
reading or watching documentaries
essay
to understand a topic in depth
novel
gain inspiration and motivation
comics
a pretty big expense
events
museums
mainly painting and archaeology
concerts
music
exhibition
temporary exhibitions
hobby
free time to spend with people motivated by the same passions
dance
couple or group dances
acting
theater
sawing
tailored costumes ~1k
lessons
learning new skills
music
occasionally
music
musical instruments and gears can be quite expensive and usually don't lose their value
gears
synth, mixer, microphones
instruments
violins, sax, clarinet, guitar
gaming
luckily I'm still stuck in finishing 8bit games so I didn't update spending
writing
a critical item in money/time optimization, it is really hard to find a topic you can cover which still has some niche to cover. It is difficult to quantify the return but I think that nowadays with AI is the most important skill to master.
blog
technical and personal articles
websites
graphics for your passions
art
pencil, papers, colors, canvas
bar
this goes along with staying with your friends
restaurants
most are overrated, despite being a waiter for over 10y I think optimize on restaurants harms not

finance_joint.png

Figure 12: free-time evolution. GAS (gear acquisition syndrom) in 2023

sport

Sport is an essential part of our lives. We can optimize a lot but knowing it's bad if we cut too much. I opted for buying gears as an initial investment and keep using them for a long time range

outdoor
passion for outdoor
sailing
something simple shared ~1k
water
kayak, swimming ~1k
diving
license pretty expensive ~1k
hiking
medium initial investment (tent, shoes) ~1k
biking
can get really expensive, I tried to be moderate ~2k
skiing
big initial investment ~2k
climbing
big initial investment ~2k
courses
rugby
acrobatics
parkour
water-polo
dance
lindy hop
forrò
folk
health
I put medical expenses in this category because sport can prevent many further expenses
prevention
usually it pays of

finance_prospect.png

Figure 13: expenses per prospect

finance_violin.png

Figure 14: expenses for the future are more concentrated

finance_boxplot.png

finance_regression.png

Figure 15: in ageing you invest more in the future

finance_correlation.png

Figure 16: luckley lifestyle doesn't grow too much with savings

finance_heatmap.png

Figure 17: more income increases lifestyle

finance_fit.png

Figure 18: trying to find a good regression

analytics

We categorize all expense types marking each entry as an expense group

finance_box.png

Figure 19: distribution of expenses

finance_scatter.png

Figure 20: expenses are correlated

finance_growth.png

Figure 21: expenses evolution

finance_quality.png

Figure 22: some missing data need to be interpolated

import os, sys, re, json
import pandas as pd
baseDir = os.environ['HOME'] + "/lav/cios/erp/bank/"
uniD = pd.read_csv(baseDir + "finance_history.csv")
print(set(uniD['group']))
{'cloth', 'lawyer', 'art', 'hardware', 'price', 'garden', 'house', 'cash', 'electronics', 'bar', 'restaurant', 'sport', 'phone', 'tax', 'bank', 'invest', 'fine', 'bike', 'charity', 'book', 'music', 'travel', 'car', 'rent', 'bill', 'event', 'health', 'boat', 'grocery', 'gift', 'salary'}

categorize expenses

I manually and automatically processed the expenses from my history

[x] uni_18 [x] uni_19 [x] uni_20 [x] uni_21 [x] uni_22 [x] uni_23 [x] uni_24 [x] uni_25 [x] uni_26 [x] vals_15 [x] vals_16 [x] vals_17 [x] vals_19 [x] vals_20

#+name estratto_conti

cd ~/lav/cios/erp/bank/
ls uni/uni*csv
ls vals/vals*csv