We know a man in Kyoto who keeps a ledger. Every evening he writes down three things: what he did, what he thought, what he wanted. He has done this for forty-three years. When we asked why, he said: “I am not keeping score. I am reading the instructions for my next life.”
That ledger is the practical face of a relationship that spans half the world’s religions. The relationship between karma and reincarnation is causal, not coincidental: karma is the force that determines the conditions of each rebirth, and reincarnation is the vehicle through which karma manifests across lifetimes. Without karma, rebirth would be random. Without reincarnation, karma would have no arena in which to work itself out.
Where These Two Concepts First Met
The earliest known reference to both ideas in the same system appears in the Upanishads, composed between 800 and 200 BCE in the Indian subcontinent. The Brihadaranyaka Upanishad (roughly 700 BCE) contains a dialogue where the sage Yajnavalkya describes how a person’s actions determine their next birth: “A man becomes good by good deeds, bad by bad deeds.” This is the first surviving text to tie ethical action directly to the mechanism of rebirth.
The word karma (Sanskrit कर्म) means “action” or “deed” before it means anything metaphysical. In the Rigveda (c. 1500–1200 BCE), it refers simply to ritual sacrifice. The shift from ritual action to moral causation took roughly a thousand years. The Chandogya Upanishad (c. 700–500 BCE) made the leap explicit: a person’s conduct in this life determines the form they take in the next, whether human, animal, or plant.
Reincarnation itself has different names in different traditions. Sanskrit uses punarjanman (rebirth). The Greek metempsychosis (the soul passing into another body) enters Western vocabulary through Pythagoras in the 6th century BCE. The Egyptian Book of Coming Forth by Day describes a journey through the underworld, but that is resurrection, not reincarnation. The relationship between karma and reincarnation as a paired system is specifically Indian in origin, then spreads east into China and Tibet and west through Hellenistic contact.
By the time the Bhagavad Gita is composed (roughly 400–200 BCE), the relationship is doctrine. Krishna tells Arjuna: “Just as the soul passes through childhood, youth, and old age in this body, so it passes into another body after death. The wise are not confused by this.” The word samsara appears here to describe the cycle itself. Karma is the engine. Reincarnation is the track.
What Each Concept Actually Does
Karma is not fate. It is not predestination. It is a law of cause and effect applied to moral and intentional actions. The Mimamsa school of Hindu philosophy argued that karma is a force operating independently of the gods, an impersonal mechanism like gravity. The Nyaya school countered that karma requires a designer, an overseer. Both agreed on the mechanism: every action leaves a residue (samskara) that shapes future experience.
Three types of karma govern how it interacts with reincarnation:
Sanchita karma is the storehouse. Every action from every past life sits here, unactivated, waiting for its turn. Prarabdha karma is the portion of sanchita that has ripened for this lifetime. It determines the circumstances of your birth: your family, your body, your country, the year you are born in. Agami karma is what you are creating right now. It will become prarabdha in a future life.
Reincarnation is the process by which the individualized consciousness (jivatman) takes a new body after death. The Garuda Purana describes the transition in detail: the soul lingers near the body for a period, then travels to the court of Yama (the god of death), where its deeds are weighed, and then returns to the earth in a new form. The body left behind is not the person. It is a garment.
The relationship is transactional in the oldest texts and relational in the later ones. The Yoga Sutras of Patanjali (c. 200 CE) treat karma as a residue that must be burned off through practice before liberation (moksha) is possible. The Tibetan Book of the Dead (Bardo Thodol, 8th century CE) describes a forty-nine-day interval between death and rebirth where the consciousness encounters visions shaped by its karma. The visions are not external. They are projections. The soul that panics and runs from a peaceful deity may be reborn in a lower realm. The soul that recognizes the deity as its own nature may achieve liberation.
How the Relationship Works: The Mechanics
Picture a bow and an arrow. Karma is the tension in the string. Reincarnation is the flight of the arrow.
The 12 links of dependent origination in Buddhism (the nidanas) map the causal chain across lifetimes. Ignorance (avidya) leads to karmic formations, which lead to consciousness, which leads to name and form, which leads to the six senses, which leads to contact, which leads to feeling, which leads to craving, which leads to clinging, which leads to becoming, which leads to birth, which leads to aging and death. Each link conditions the next. Break any one link, and the chain collapses.
The Buddha’s first sermon at Sarnath (c. 528 BCE) presented the Four Noble Truths. The second truth is that craving causes suffering. The third is that ending craving ends suffering. The fourth is the Eightfold Path. What is less quoted is that the Buddha framed this entire diagnosis in the language of reincarnation. Craving does not just cause suffering in this life. It fuels the desire for continued existence, which drives rebirth. Karma is the record of where that craving has led.
Jainism takes the relationship further. In Jain doctrine, karma is not a metaphor or a law. It is a physical substance. Karmic matter clings to the soul like dust to a wet cloth. Every action, every thought, every word draws karmic particles to the soul. These particles weigh it down and keep it in the cycle of rebirth. Liberation means stripping every particle away through ascetic practice. The soul that succeeds rises to the top of the universe, siddhashila, where it exists forever in pure consciousness. The soul that fails takes another body, another chance, another layer of dust.
The Western Reinterpretation
The relationship changes when it crosses cultural boundaries. Theosophy, founded by Helena Blavatsky in 1875, synthesized Hindu and Buddhist concepts with Western esotericism. Blavatsky rejected the idea of a personal soul being reborn. She taught that the higher self reincarnates through a series of personalities, each one a temporary expression of the eternal spark. Karma in Theosophy is not punishment. It is cosmic balance, a law of harmony that restores equilibrium across lifetimes.
Edgar Cayce (1877–1945), the American “sleeping prophet,” gave thousands of readings that described past lives and their karmic consequences. Cayce’s model introduced a distinctly Western element: grace. He taught that karma could be transcended through prayer and service, not just burned off through suffering. This softened the deterministic edge of the traditional Indian model.
Modern Western paganism and occultism often treat the relationship as a tool for spiritual growth rather than a cosmic law of justice. Wicca and other Neopagan traditions frequently invoke the Threefold Law: whatever energy you send out returns three times over. This is not traditional karma. It is a vernacular adaptation that fits Western individualism. The Threefold Law is a moral feedback loop, not a mechanism spanning multiple lifetimes.
What People Get Wrong
The most common misunderstanding is that karma punishes. It does not. It is not a judgment. It is a consequence. If you drop a stone, gravity does not punish the stone. The stone falls.
The second misunderstanding is that reincarnation is linear progress. Many people imagine they are climbing a ladder of lifetimes, each one better than the last. Traditional texts do not support this. The Buddhist cosmology describes six realms of rebirth: god, demigod, human, animal, hungry ghost, and hell. A person can be reborn in any of them based on their karma. Progress is not guaranteed. One lifetime of cruelty can send a human to a hell realm. One moment of compassion can lift a hungry ghost back to human birth. The cycle is a wheel, not a staircase.
The third misunderstanding is that karma explains suffering. This is technically true but practically dangerous. The Bhagavad Gita warns against using karma to justify social hierarchy. The Buddha explicitly rejected the idea that suffering is always deserved. He taught that karma accounts for only one factor among many. Conditions, accidents, and other beings also cause suffering. Karma is not a justification. It is an invitation to act differently now.
FAQ
Does karma determine everything that happens to me? No. Karma is one factor among many. Natural events, other people’s actions, and accidents also shape your experience. The Buddha listed eight conditions that affect a person’s life, with karma being only one of them.
Can I change my karma? Yes. Every action you take right now is agami karma, the karma you are creating. Past karma cannot be erased, but its effects can be mitigated through present choices. The Yoga Sutras describe meditation as the fire that burns karmic seeds before they sprout.
Do animals have karma? In Hindu, Buddhist, and Jain traditions, yes. Animals are beings reborn into that form due to past karma. Their ability to create new karma is limited by their awareness, but they still experience the consequences of past actions.
How do I know if I have been reincarnated? Traditional texts say memory of past lives is extremely rare, usually requiring deep meditative states or special spiritual attainment. The Jataka tales claim the Buddha remembered all of his past lives. Most people do not, and the texts treat this as normal.
The Karma That Writes Itself
The man with the ledger in Kyoto will die one day. His son will burn the ledger in a Buddhist ceremony, or he will keep it in a box, or he will throw it away. None of that matters. What matters is what the ledger recorded. The ledger itself is the karma.
Every action leaves a trace. That trace shapes what comes next. We see this in ordinary life: how a lie builds a structure of more lies, how a single act of kindness can redirect a day, how a habit becomes a character and a character becomes a destiny. Karma and reincarnation are the same principle written across the scale of multiple lives. The only question is whether we read the ledger while we can still write in it.
For a deeper look at how this applies in practice, read our guide on karma and reincarnation in daily life. You can also explore the glossary entry on samsara and our guide to the Buddhist nidanas. The wheel turns. The choice is when to step off.